🛁 Waterway Iron Might 3410030-1E Spa Circulation Pump – 1/15 HP Single Speed 115V

American-made efficiency delivering powerful 40 GPM circulation for your spa

♨️ Product Overview

The Waterway Iron Might 3410030-1E is a premium, American-made circulation pump designed for continuous 24-hour operation in hot tubs, spas, and pond applications. Manufactured by Waterway Plastics in Oxnard, California — a company committed to innovation and excellence since 1973 — the Iron Might delivers an impressive 40 GPM flow rate while drawing only 1.3 amps at 115V, making it one of the most energy-efficient circulation pumps available.

Built around a proven 48-frame single-speed motor running at 1725 RPM, this pump features a side discharge configuration with 1-1/2″ MBT plumbing connections for center suction intake and optimum flow delivery. The Iron Might is purpose-built to work with high-flow 15″ x 2″ spa heaters, ensuring efficient heat distribution throughout your spa. Its durable Viton seals, corrosion-resistant construction, and robust 8-screw volute design deliver the dependability that spa owners demand.

The Iron Might is widely used as a direct replacement for Aqua-Flo/Gecko Circ-Master CMHP circulation pumps and is compatible with a broad range of hot tub brands and spa control systems. Waterway’s reputation for quality American-made products makes the Iron Might a trusted choice for professionals and DIY spa owners alike.

✨ Key Features

• ✅ 24-Hour Continuous Circulation – Rated for non-stop operation to maintain water clarity, temperature, and consistent filtration
• ✅ 40 GPM Flow Rate – High-flow design delivers strong water circulation for effective filtration and heating
• ✅ Ultra-Low 1.3 Amp Draw – Extremely energy-efficient at 115V, minimizing operating costs during continuous 24-hour use
• ✅ 1/15 HP Single Speed Motor – 48-frame proven design motor running at 1725 RPM for dependable, long-lasting performance
• ✅ Side Discharge Configuration – Optimized flow path for efficient water movement through spa plumbing systems
• ✅ 1-1/2″ MBT Connections – Standard 1-1/2″ inlet and discharge with 2-7/16″ outer diameter threads for broad compatibility
• ✅ Viton Seals – Premium chemical-resistant seals provide superior leak protection, especially in ozone and salt-treated water
• ✅ Made in the USA – Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California
• ✅ High-Flow Heater Compatible – Works with high-flow 15″ x 2″ spa heaters for efficient heat transfer
• ✅ Rotatable Wet End – Wet end orientation can be adjusted to match your existing plumbing layout
• ✅ Dual Drain Plugs – Two drain plugs for easy winterization and maintenance
• ✅ Warranty – 1-year manufacturer warranty on motor, 3-year warranty on wet end

🔩 Technical Specifications

Specification	Value
Pump Type	Circulation Pump (24-Hour)
Series	Iron Might
Motor Power	1/15 HP
Speed Settings	Single Speed
Motor Speed (RPM)	1725
Flow Rate	40 GPM
Voltage	115V
Frequency	60 Hz
Amperage	1.3 A
Frame Type	48 (Thru-Bolt)
Inlet Port	1-1/2″ MBT (Center Suction)
Discharge Port	1-1/2″ MBT (Side Discharge)
Thread Dimensions	2-7/16″ OD / 1-7/8″ ID
Dimensions (H x W x L)	8-1/4″ x 6-1/2″ x 12″
Seal Type	Viton (PS-1000 standard / PS-3865 Viton upgrade)
Shaft Size	5/8″
Volute Fasteners	8 Screws
Drain Plugs	2
Self-Priming	No — pump must be installed below water level
Cord Included	No — cord not supplied
Unions Included	No — sold separately (Waterway 400-4060B)
Optional Debris Basket	Available – Part No. 310-5400
UPC	806105066459
Manufacturer	Waterway Plastics, Oxnard, California, USA
Country of Origin	United States
Motor Warranty	1 Year
Wet End Warranty	3 Years

🔌 Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V
Frequency	60 Hz
Phase	Single Phase
Full Load Amps	1.3 A
Cord	Not included — use existing cord or purchase separately

💡 230V Version Available: If your spa system requires 230V, the Waterway Iron Might is also available in a 230V version — model 3410020-1E (0.8A at 230V). Always verify your system voltage before ordering.

⚠️ IMPORTANT ELECTRICAL SAFETY WARNINGS:

• All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes.
• Hot tubs and spas require GFCI (Ground Fault Circuit Interrupter) protection — this is mandated by the NEC.
• A dedicated circuit is required — do not share the circuit with other appliances.
• Ensure proper grounding and bonding per NEC requirements.
• Verify your system voltage (115V or 230V) before ordering. This model (3410030-1E) operates on 115V only.

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🔄 Compatibility Guide

Frame and Connection Details

Specification	This Pump
Frame Type	48 (Thru-Bolt)
Inlet	1-1/2″ MBT (Center Suction)
Discharge	1-1/2″ MBT (Side Discharge)
Thread OD	2-7/16″
Thread ID	1-7/8″

Waterway Cross-Reference Part Numbers

Part Number	Notes
3410030-1E	Current primary model (115V)
3410030-0E	Previous version
3410030-0E6TU	Previous version
3410030-1EHZN	Iron Might OEM variant
3410030-1EHZW	Iron Might OEM variant
34100301E	Alternate format (no dashes)
CP-1/8-1N11A	Waterway model designation
CP-1/8-1N11MA	Waterway model designation
CP-1/15-1N22A	Waterway model designation
WWP34100301E	Distributor part number
WW34100301E	Distributor part number
5175-011	INYOPools part number

230V Iron Might Version

Part Number	Notes
3410020-1E	Iron Might 230V version (0.8A)
34100201E	Alternate format (no dashes)
3410020-1EHZN	OEM variant
CP-1/8-1N22A	Waterway model designation
WWP34100201E	Distributor part number
5175-012	INYOPools part number

Replaces Aqua-Flo / Gecko Circ-Master Pumps

Part Number	Notes
02093000-2010	Aqua-Flo CMHP 115V
02093001-2010	Aqua-Flo CMHP 230V
02093695-2	Aqua-Flo CMHP
02410512-2	Aqua-Flo CMHP
02093002	Aqua-Flo CMHP
02093003	Aqua-Flo CMHP
02093004	Aqua-Flo CMHP
02093006	Aqua-Flo CMHP
02093007	Aqua-Flo CMHP
02093400	Aqua-Flo CMHP
02093448	Aqua-Flo CMHP
02093466	Aqua-Flo CMHP
02093492	Aqua-Flo CMHP
02093634	Aqua-Flo CMHP
02093638	Aqua-Flo CMHP
02093639	Aqua-Flo CMHP
02093656	Aqua-Flo CMHP
02093658	Aqua-Flo CMHP

Other Cross-Reference Part Numbers

Part Number	Notes
48WTC0153C-I	LX Lingxiao equivalent circulation pump
1-00-0182	Allied/Gecko
1-00-0204	Allied/Gecko
14154	Gecko
34-270-1050	Distributor part number
34-402-1140	Distributor part number
15-350-255	Distributor part number
1030011	Cross-reference
1030057	Cross-reference
1030125	Cross-reference
10-0265-4A3-K	Cross-reference
10-0265-A	Cross-reference
104440	Cross-reference

Compatible Applications

This pump is widely used in hot tubs and spas that require a 1/15 HP (or 1/8 HP), 48-frame, side-discharge circulation pump with 1-1/2″ MBT plumbing connections. It is compatible with most spa control systems including Balboa, Gecko, and Waterway controllers.

💡 Compatibility Tip: To confirm this pump fits your spa, check your existing pump for: 48-frame, 1/15 HP or 1/8 HP, 115V, 1.3A, 1-1/2″ plumbing, side discharge configuration. If your current pump matches these specifications, the Iron Might 3410030-1E is a direct replacement. When matching pumps, always verify amperage as the primary matching criterion.

🔧 Installation Requirements

Mounting

Requirement	Specification
Mounting Position	Horizontal — on a solid, level surface
Water Level	Pump must be installed below water level (not self-priming)
Drainage	Installation area should have adequate floor drainage
Moisture Protection	Pump should be protected from excessive moisture
Access	Allow adequate space to service pump and plumbing

Plumbing Connections

Connection	Size
Suction (Inlet)	1-1/2″ MBT (Center)
Discharge	1-1/2″ MBT (Side)
Thread OD	2-7/16″
Thread ID	1-7/8″
Union Type	Waterway male union threads (unions sold separately)

Union Options

Part Number	Description
400-4060B	1-1/2″ Standard thread union
425-2020HB	1″ Hose barb union (optional)
425-2020	1″ PVC union (optional)

Shut-Off Valves

Waterway recommends installing shut-off valves on both the inlet and outlet of the pump for future maintenance convenience.

Installation Notes

⚠️ Pump must be installed below water level — the Iron Might is not self-priming.

⚠️ Never run the pump dry — operating without water causes immediate seal damage.

⚠️ HAND TIGHTEN UNIONS ONLY! Do not use a wrench or any adhesives or solvents on unions.

⚠️ Do not use pipe sealant. Use only Teflon tape or other sealing compounds approved for use with plastic. Unapproved sealants can cause stress cracking of plastic parts.

⚠️ When performing pressure tests, do not exceed 40 PSI. Use a pressure regulator and ensure all air is removed from the system.

⚠️ Ensure proper grounding and bonding per NEC requirements.

⚠️ GFCI protection is required by code for all hot tub and spa installations.

⚠️ This pump does not include a power cord. Use your existing pump cord or purchase a new one separately.

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⚙️ Maintenance Guide

Routine Maintenance

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around mechanical seal and union connections
Inspect unions	Monthly	Hand tighten only — no wrenches or adhesives
Clean debris basket (if installed)	As needed	Optional basket part No. 310-5400
Check amperage draw	Annually	Should read approximately 1.3A at 115V
Inspect motor vents	Quarterly	Keep clear of debris for proper cooling
Inspect drain plugs	Quarterly	Ensure tight and leak-free
Check mounting and volute screws	Quarterly	Tighten if loose to minimize vibration

Warning Signs – Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from the mechanical seal area
• Motor trips the circuit breaker repeatedly
• Noticeably reduced water flow
• Motor overheating or excessively hot to the touch
• Pump fails to start or starts intermittently

Seal Replacement

Specification	Detail
Standard Seal	PS-1000 (5/8″ shaft, standard grade)
Viton Upgrade Seal	PS-3865 (5/8″ shaft, extra heavy duty Viton)
Seal Materials	Carbon graphite primary ring, polished ceramic seat, 304 stainless steel hardware

💡 Seal Tip: The PS-3865 Viton seal is recommended for spas using ozone generators or salt chlorine generators, as these systems are more corrosive and require chemically resistant seal materials. The Viton upgrade provides significantly longer seal life in these applications.

⚠️ Replace the seal at the first sign of water leakage from the seal area. Continuing to operate a pump with a leaking seal will cause motor damage.

Replacement Parts (Waterway)

Part Number	Description
310-1000	Iron Might Wet End
310-0900B	Impeller
311-1060	Diffuser
805-0248	Diffuser O-Ring
PS-1000	Shaft Seal (Standard)
PS-3865	Shaft Seal (Viton Heavy Duty)
400-4060B	1-1/2″ Union
310-5400	Optional Debris Basket
R221016	Capacitor
715-1201B	Drain Plug
805-0112B	O-Ring

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Hot tub 24-hour circulation	Yes	Primary designed application — continuous filtration and heating
♨️ Spa high-flow heating systems	Yes	Specifically designed to work with 15″ x 2″ high-flow heaters
♨️ Spa water circulation	Yes	Maintains water clarity and even temperature distribution
🛁 Whirlpool bath circulation	Yes	Compatible with whirlpool systems using 1-1/2″ plumbing
💧 Pond / water feature	Yes	Suitable for ponds, koi ponds, and fountain applications
♨️ Jet pump replacement	No	This is a low-power circulation pump — not designed for jet power

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❓ Frequently Asked Questions

Q: What horsepower is this pump? A: The Iron Might 3410030-1E is rated at 1/15 HP. It has also been designated as 1/8 HP at various times by Waterway — both ratings refer to the same pump with identical specifications (1.3A, 40 GPM, 1725 RPM). The difference is in the horsepower rating method, not the actual pump.

Q: Will this fit my hot tub? A: This pump has a 48-frame motor with 1-1/2″ MBT inlet (center suction) and 1-1/2″ MBT side discharge. It is a direct drop-in replacement for Aqua-Flo/Gecko Circ-Master CMHP and other 48-frame, 1-1/2″, side-discharge circulation pumps. When matching, always verify amperage as the primary matching criterion.

Q: What voltage does this pump require? A: This model (3410030-1E) requires 115V / 60 Hz. If you need a 230V version, order the Waterway Iron Might model 3410020-1E instead. All electrical work must be performed by a licensed electrician.

Q: Does this pump come with unions? A: This pump is sold without unions (listed as “Less Unions”). Waterway 1-1/2″ unions (part 400-4060B) are available separately. Optional 1″ hose barb unions (425-2020HB) and 1″ PVC unions (425-2020) are also available.

Q: Does this pump come with a power cord? A: No. The Iron Might does not include a power cord. You will need to use your existing pump cord or purchase a new one separately.

Q: Is this pump self-priming? A: No. The Iron Might is not self-priming. The pump head must be installed below the water level (flooded suction) for proper operation.

Q: Is this pump made in the USA? A: Yes. The Iron Might is designed, engineered, and manufactured by Waterway Plastics in Oxnard, California, USA.

Q: What is the difference between the Iron Might and the Tiny Might? A: The Iron Might (3410030-1E) has 1-1/2″ plumbing connections and delivers 40 GPM at 1.3 amps. The Tiny Might has smaller 1″ plumbing connections and delivers 18 GPM at 0.8 amps. The Iron Might is designed for higher-flow applications including spas with high-flow heating systems.

Q: Can I use this pump for a pond or water feature? A: Yes. The Iron Might is rated for pond, koi pond, and fountain applications. It must be installed below water level as it is not self-priming.

Q: What size are the ports? A: Both the suction (inlet) and discharge ports are 1-1/2″ MBT. Measuring from outside thread to outside thread, the fittings are approximately 2-7/16″ OD with a 1-7/8″ ID.

Q: What warranty is included? A: The Waterway Iron Might carries a 1-year manufacturer warranty on the motor and a 3-year warranty on the wet end. Proof of purchase is required. Contact Parts4Tubs for full warranty terms and support.

Q: How do I know if my pump needs replacing? A: Signs include unusual noise (grinding or screeching), water leaking from the seal area, reduced water flow, the motor tripping the circuit breaker, or the motor overheating. If your spa displays a flow error code (such as FLO), a failing circulation pump is a common cause.

Q: Do I need a GFCI breaker? A: Yes. GFCI (Ground Fault Circuit Interrupter) protection is required by the National Electrical Code (NEC) for all hot tub and spa electrical installations.

Q: Can I replace an Aqua-Flo Circ-Master CMHP with this pump? A: Yes. The Iron Might 3410030-1E is a direct replacement for Aqua-Flo/Gecko Circ-Master CMHP circulation pumps (02093000-2010 for 115V). It is an identical match in frame size, plumbing connections, and performance specifications.

Q: Is this pump California Title 20 compliant? A: Yes, the Iron Might is California Title 20 compliant for spa circulation use. Note that California Title 20 regulations (CCR sections 1601-1609) restrict single-speed pumps of 1 total HP or greater for residential pool filtration, but this 1/15 HP circulation pump is well below that threshold.

📥 Downloads & Resources

📄 Iron Might Installation Manual (PDF) – Official Waterway installation instructions

⭐ Why Choose the Waterway Iron Might 3410030-1E

• ✅ American-Made Quality – Designed, engineered, and manufactured by Waterway Plastics in Oxnard, California — committed to innovation and excellence since 1973
• ✅ Ultra-Efficient Operation – Only 1.3 amps at 115V for 24-hour continuous circulation, keeping energy costs exceptionally low
• ✅ Strong 40 GPM Flow – High-flow design delivers effective filtration turnover and works with high-flow spa heating systems
• ✅ Proven 48-Frame Design – Industry-standard frame size with decades of proven reliability in hot tub and spa applications
• ✅ Premium Viton Seals – Chemical-resistant seal technology for dependable leak-free operation, even with ozone and salt systems
• ✅ Broad Compatibility – Direct replacement for Aqua-Flo/Gecko CMHP, LX, and other matching circulation pumps
• ✅ Dual Warranty Coverage – 1-year motor warranty plus 3-year wet end warranty from Waterway
• ✅ Extensive Parts Availability – Full range of genuine Waterway replacement parts readily available

🤝 Why Buy from Parts4Tubs

• ✅ US-based support for American customers
• ✅ Fast shipping across the United States
• ✅ Expert advice from spa and hot tub specialists
• ✅ Competitive pricing in USD
• ✅ Full warranty support
• ✅ Hassle-free returns
• ✅ Replacement seals, wet ends, unions, and parts available
• ✅ Dedicated customer service team

💧 Summary

The Waterway Iron Might 3410030-1E is a premium American-made 1/15 HP single-speed circulation pump delivering 40 GPM of continuous flow at just 1.3 amps. With its proven 48-frame design, 1-1/2″ MBT side discharge configuration, Viton seals, and compatibility with high-flow spa heaters, it provides dependable 24-hour circulation for hot tubs, spas, and pond applications. Backed by Waterway’s 1-year motor and 3-year wet end warranty. Order today from Parts4Tubs for fast shipping and expert support.

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	Magic Plastics Union 0602-15 (1.5″ Pump Union) | 1-1/2″S x 1-1/2″FBT Union, Pump, Magic, 1-1/2"S x 1-1/2"FBT (Industry Standard) w/ O-Ring	$6.36 Max: 508 Min: 1 Step: 1 Add to cart
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	Waterway Union 400-6010 | 2-1/2″ Union Nut with 2-1/2″ Slip tailpiece and o-ring (2.5″ union) Union, Pump, Waterway, 2-1/2"FBT x 2-1/2"S	$14.77 Max: 144 Min: 1 Step: 1 Add to cart
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Hot Tub Pump Collar & Union Size Chart

Imperial & Metric Specifications

Union Size	Collar Size	Thread OD	Union OD	O-Ring Size
1.5" Female Buttress Thread (FBT)	2.5" / 64mm (Tip to Tip) Measurement	2-1/2" 64mm	2-13/16" 71mm	2-5/16" OD 59mm
2" Female Buttress Thread (FBT)	3.1" / 78mm (Tip to Tip) Measurement	3-1/16" 78mm	3-3/8" 81mm	2-15/16" OD 75mm
2.5" Female Buttress Thread (FBT)	3.6" / 91mm (Tip to Tip) Measurement	3-5/8" 91mm	4-1/4" 108mm	3-7/16" OD 87mm

Important Notes

The union "size" (1.5", 2", 2.5") is nominal and doesn't correspond to any actual measurement.

Collar size is measured from thread tip to thread tip on the pump outlet.

Most hot tub pumps use Female Buttress Thread (FBT) - 98% of applications.

O-ring gaskets may vary between manufacturers - measure your existing gasket for accuracy.

How do I Replace a Hot Tub Pump?

Here's a general step-by-step guide on how to replace a hot tub pump. Keep in mind that the specific steps may vary depending on your hot tub's make and model, so it's essential to consult your hot tub's manual for model-specific instructions. If you're not comfortable with this procedure, it's a good idea to seek professional assistance.

Materials You'll Need:

• Replacement pump
• Pipe wrench
• Adjustable wrench
• Screwdriver
• Pipe sealant (thread tape or plumber's putty)
• PVC primer and cement (if you have PVC plumbing)
• Teflon tape (for threaded connections)

Procedure:

1. Turn Off the Power: Before you begin, ensure the hot tub's power supply is turned off at the circuit breaker or disconnect switch. Safety should always be a priority when working with electrical components.

2. Drain the Hot Tub: If your hot tub is not already empty, you'll need to drain it. Follow your hot tub's manual or manufacturer's instructions for proper draining. (You might not need to do this if you can lock the pump off with the gate valves)

3. Locate the Pump: Identify the location of the existing pump in your hot tub. It's usually located near the equipment area or in a designated pump compartment.

4. Disconnect the Electrical Wiring: Carefully disconnect the electrical wiring from the old pump. This typically involves removing the electrical conduit cover, unscrewing wire nuts, and disconnecting the wires from the terminals. Be sure to note the wire connections or take a picture for reference when connecting the new pump.

5. Disconnect the Plumbing: Depending on your hot tub's plumbing setup, you'll need to disconnect the plumbing connections to the pump. Use a pipe wrench or adjustable wrench to loosen and remove the fittings. Be prepared for some water spillage when disconnecting the plumbing.

6. Remove the Old Pump: Once the electrical and plumbing connections are detached, carefully remove the old pump from its mounting position. Some pumps may be secured with mounting brackets or bolts.

7. Prepare the New Pump: If the new pump is not pre-assembled, you may need to attach fittings, unions, or adapters to match your hot tub's plumbing. Ensure that you use the appropriate sealant or Teflon tape on threaded connections to prevent leaks.

8. Mount the New Pump: Position the new pump in the same location as the old one and secure it in place using the mounting brackets or bolts.

9. Reconnect Plumbing: Reconnect the plumbing to the new pump, ensuring that all connections are tight and secure. If your hot tub uses PVC plumbing, use PVC primer and cement to bond the connections properly.

10. Reconnect Electrical Wiring: Reconnect the electrical wiring to the new pump, following the notes or pictures you took earlier. Make sure all wires are properly connected and secure.

11. Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.

12. Test the Pump: Turn on the hot tub's pump to ensure that it's working correctly. Check for any signs of leaks or irregularities in the plumbing connections.

13. Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.

14. Check for Leaks: Inspect the plumbing connections for any leaks. If you find any, turn off the pump, drain the tub again, and reseal the connections as needed.

15. Monitor: Keep an eye on the pump and plumbing for the next few days to ensure everything is functioning correctly and that there are no further issues.

Remember that this is a general guideline, and the specific steps may vary based on your hot tub's design. If you're unsure or uncomfortable with any aspect of this process, please do get in touch, happy to help.

How do I know what size hot tub pump I have?

Determining the size of your hot tub pump is an important step when it comes to maintenance or replacement. To find out the size of your hot tub pump, follow these steps:

1. Check the Manual: The easiest way to determine the size of your hot tub pump is to consult the owner's manual or user documentation that came with your hot tub. The manual typically contains detailed information about the specifications and components of your hot tub, including the pump.

2. Look at the Pump Housing: If you don't have access to the manual or it doesn't provide the information you need, inspect the pump itself. Most hot tub pumps have a label or plate on the pump housing that displays essential details, including the pump's model number, manufacturer, and specifications. You can then send that to me or Google it.

3. Measure the Pump: If the label is missing or damaged, you can measure the pump's dimensions. Measure the diameter of the pump's wet end (the part where the water flows) and the length of the wet end. These measurements can help identify the size and capacity of the pump.

4. Consult the Manufacturer: If you can't find the information on the pump or in the manual, contact the hot tub manufacturer or a reputable dealer. Provide them with your hot tub's model and serial number, and they should be able to identify the correct pump size for your specific hot tub.

5. Online Research: You can also search online using the pump's model number or hot tub's make and model. Many manufacturers provide detailed information about their products on their websites, and you may find specifications for your pump model.

Once you have determined the size and specifications of your hot tub pump, you can proceed with maintenance, repairs, or replacement if necessary. Keep in mind that replacing a hot tub pump with the same size and capacity as the original is crucial to ensure proper water circulation and filtration in your hot tub. If you're unsure about any aspect of this process, get in touch, always happy to help.