🛁 LX Lingxiao WBH75 Bath Pump — 0.5 HP 115V 5.0A Single-Speed Whirlpool Bath Pump with Air Switch, NEMA Cord & Unions

Compact, quiet replacement for Balboa WOW and Waterway Genesis entry-level bath pumps — complete with cord, unions, and air switch

🔄 Product Overview

The LX WBH75 is a 0.5 HP, 115V, 5.0A single-speed whirlpool bath pump manufactured by Guangdong Lingxiao (LX Pumps), one of the largest bath and spa pump manufacturers in China with over 46 years of production experience. It features a front/top wet end configuration with center discharge and bottom suction, using standard 1-1/2″ Male Buttress Thread (MBT) connections that measure 2-7/16″ OD.

The WBH75 is the smallest pump in the LX WBH family and comes as a complete ready-to-install package — it includes a 3-foot NEMA power cord with plug, two 1-1/2″ unions with o-rings, and a built-in air switch. At only 12-7/16″ long, it is the most compact option in the lineup and ideal for smaller jetted bathtubs with limited equipment space. The WBH75 is a popular and cost-effective direct replacement for the Balboa Vico WOW 1010031/1050031 (0.5 HP, 5.5A) and Waterway Genesis 321FF10-0150 (5.5A) bath pumps. The pump features a glass reinforced composite housing, dry run mechanical seal, self-draining volute, and an air-cooled pure copper winding motor rated for continuous duty with IPX4 protection.

⚠️ THIS IS A WHIRLPOOL BATH PUMP — designed for jetted bathtubs only. Not intended for continuous hot tub/spa circulation use.

⭐ Key Features

• ✅ 0.5 HP Single-Speed Motor — 115V / 60Hz / 5.0A — pure copper winding for whisper-quiet operation
• ✅ Complete Package — 3′ NEMA cord with plug, two 1-1/2″ unions with o-rings, and built-in air switch all included
• ✅ Most Compact in Family — Only 12-7/16″ long — ideal for tight installation spaces
• ✅ Direct Replacement — Replaces Balboa Vico WOW 1010031/1050031, Waterway Genesis 321FF10-0150, and Gecko/Whirlmaster 04207001-5010
• ✅ Self-Draining Volute — Water drains automatically when pump turns off, preventing stagnant water buildup
• ✅ Dry Run Mechanical Seal — Designed for reliability in bath pump applications with intermittent use
• ✅ Glass Reinforced Composite Housing — High-strength engineering plastic for corrosion resistance and durability
• ✅ Air-Cooled Motor — Aluminum front and back covers with excellent heat dissipation
• ✅ 1-1/2″ MBT Connections — Standard Male Buttress Thread (measures 2-7/16″ OD) — fits most whirlpool bath plumbing
• ✅ UL Recognized & CSA Certified — IPX4 protection, Class B insulation, continuous duty rated
• ✅ 1-Year Manufacturer Warranty — Shaft seal carries 3-month part-only warranty

⚙️ Technical Specifications

Specification	Value
Manufacturer	Guangdong Lingxiao (LX Pumps)
Model	WBH75 (with cord) / WCH75 (without cord)
Pump Type	Whirlpool bath pump (front/top wet end)
Motor Power	0.5 HP (1/2 HP)
Input Power	0.55 kW
Speed	Single speed
RPM	3,450
Voltage	115V
Frequency	60 Hz
Amperage	5.0A
Frame Type	48 Frame Thru-Bolt
Suction Port	1-1/2″ MBT — bottom (measures 2-7/16″ OD)
Discharge Port	1-1/2″ MBT — center (measures 2-7/16″ OD)
Dimensions (L × W × H)	12-7/16″ × 5-1/4″ × 6-15/16″
Housing Material	Glass reinforced composite
Seal Type	Dry run mechanical seal
Self-Draining	Yes
Motor Type	Air-cooled, pure copper winding
Insulation	Class B
Protection Rating	IPX4
Duty Rating	Continuous
Certifications	UL Recognized, CSA Certified
Warranty	1 year manufacturer (shaft seal: 3 months part only)

⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V (110-120V)
Frequency	60 Hz
Phase	Single
Full Load Amps	5.0A
Minimum Circuit Breaker	15A
Wire Size (Recommended)	14 AWG

⚠️ IMPORTANT:

All electrical work must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local building codes. Whirlpool bath installations require GFCI (Ground Fault Circuit Interrupter) protection. A dedicated circuit is recommended — do not share with other high-draw appliances.

📦 What’s in the Box

Item	Quantity	Notes
LX WBH75 bath pump	1	Complete pump assembly with motor
1-1/2″ unions with o-rings	2	For suction and discharge connections
3′ NEMA power cord with plug	1	36″ cord, standard 3-prong plug (WBH75 only)
Built-in air switch	1	Factory installed — air button and hose NOT included

⚠️ Air button and 1/4″ air hose are sold separately. The pump has a built-in air switch but requires an external air button (typically mounted on the bath tub surface) connected via 1/4″ air tubing (1/8″ ID × 1/4″ OD). Standard air button hole size: 1-3/8″ for a 1-3/4″ diameter air button.

🔗 WBH75 vs WCH75 — What’s the Difference?

Feature	WBH75	WCH75
3′ NEMA Power Cord	✅ Included	❌ Not included — reuse old cord
Unions	✅ Included (2x with o-rings)	✅ Included (2x with o-rings)
Air Switch	✅ Built-in	✅ Built-in
Motor & Specs	Identical	Identical
Dimensions	12-7/16″ × 5-1/4″ × 6-15/16″	12-7/16″ × 5-1/4″ × 6-15/16″

The WBH75 includes a 3-foot NEMA power cord with plug — ready to plug in immediately. The WCH75 does not include a power cord — you must transfer the cord from your old pump onto this new one. All other specifications are identical.

💡 Choose WBH75 if your old pump’s cord is damaged, if you prefer a fresh cord, or for first-time installations. Choose WCH75 if your existing cord is in good condition and you want to save a few dollars.

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🔄 Compatibility & Cross-Reference Guide

Direct Replacement For:

Pump	Brand	HP	Amps	Notes
1010031 / 1050031	Balboa Vico WOW	0.5 HP	5.5A	Same plumbing footprint
321FF10-0150	Waterway Genesis	0.5 HP	5.5A	With NEMA cord & air switch
04207001-5010	Gecko / Whirlmaster	—	5.0A	OEM bath pump
WW050	Waterway	—	—	Legacy model

Alternate / Cross-Reference Part Numbers:

Part Number	Source / Brand
WBH75	LX Lingxiao (with cord)
WCH75	LX Lingxiao (without cord)
34-343-1000	OEM cross-reference
WW050	Waterway cross-reference
3312620-14	OEM cross-reference
04207001-5010	Gecko / Whirlmaster
753746-402	OEM cross-reference
955523	OEM cross-reference
PX10000SCB	OEM cross-reference
WPP600A	OEM cross-reference
10-1010031	Balboa WOW cross-reference

Plumbing Compatibility:

📍 Frame: 48 Frame Thru-Bolt
📍 Suction: 1-1/2" MBT — bottom (measures 2-7/16" OD)
📍 Discharge: 1-1/2" MBT — center (measures 2-7/16" OD)
📍 Unions: Included (1-1/2" with o-rings)

⚠️ DIMENSION NOTE: The WBH75 measures 12-7/16″ × 5-1/4″ × 6-15/16″ — it is approximately 3/4″ shorter than the WBH100 (13-3/16″ L) and is the most compact pump in the LX bath pump family. Plumbing connections (1-1/2″ MBT) are compatible with the same tubs. Width and height are identical across all WBH/WCH models.

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⚠️ HP Rating Discrepancy — Important Information

The LX WBH75 has a documented HP rating discrepancy across retailers:

Source	Listed HP	Listed Amps
Spa Parts Plus (Parts4Tubs)	0.5 HP	5.0A
SpaCare	1/2 HP	5.0A
Hot Tub Outpost (WBH75)	0.5 HP	5.0A
LX Model Numbering (WBH75)	0.75 HP	5.0A
Amazon LX (WCH75)	0.75 HP	5.0A
Hot Tub Outpost (WCH75)	3/4 HP	5.0A
Wild West Pool Supplies	3/4 HP	5.0A
Pool-Spa-Supplies	—	5.0A

Why the discrepancy? LX’s model numbering convention uses the number to indicate HP (WBH75 = 0.75 HP), and their input power rating is 0.55 kW. Several US distributors rate it at 0.5 HP based on the amperage draw matching 1/2 HP motors. The amperage (5.0A) is consistent across all sources and is the most reliable spec for matching. When replacing a 0.5 HP, 5.0-5.5A bath pump such as the Vico WOW 1010031/1050031, the WBH75 is the correct replacement.

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🛠️ Installation Guide

Step-by-Step Installation:

1. Disconnect power — Unplug the old pump from the electrical outlet. Never work on plumbing with power connected.
2. Disconnect plumbing — Loosen the union fittings on both the suction and discharge connections. Have towels ready for residual water.
3. Remove old pump — Slide the old pump out of position.
4. Install new unions — If replacing unions, cut existing PVC pipe cleanly. The 1-1/2″ PVC schedule 40 pipe slides into the union — it is NOT threaded into the inlet/outlet.
5. Position new pump — Place the WBH75 in the same orientation as the old pump (suction on bottom, discharge in center).
6. Connect plumbing — Hand-tighten unions to suction and discharge ports. Do not over-tighten.
7. Connect air tubing — Attach 1/4″ air hose from the air button to the air switch nipple on the pump.
8. Plug in NEMA cord — Connect the 3-prong plug to a GFCI-protected outlet.
9. Test operation — Press the air button to activate the pump. Fill the tub with water BEFORE running the pump.

Installation Notes:

⚠️ Never run the pump dry — always ensure water is above the jet level before activating

⚠️ If the motor doesn’t start when plugged in, the air switch may be in the “off” position — press the air button to toggle

⚠️ Pump must be installed below water level (flooded suction) for proper operation

⚠️ Ensure proper grounding and GFCI protection per NEC requirements

⚠️ There is no industry standard for bath pump unions — the unions provided may require cutting off your old unions and installing the new ones

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🔩 Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Check for leaks	Monthly	Around seal plate and union connections
Inspect unions	Monthly	Tighten if needed — do not over-tighten
Check motor vents	Quarterly	Keep clear of debris for proper air cooling
Inspect NEMA cord	Quarterly	Look for damage, cracking, or discoloration
Check amperage	Annually	Should read approximately 5.0A under load

Warning Signs — Replace Pump If:

• Unusual noise (grinding, screeching, or humming without rotation)
• Water leaking from the seal plate area
• Motor trips the circuit breaker repeatedly
• Reduced water flow or jet pressure
• Motor overheating or burning smell
• Pump fails to start when air button is pressed (and air switch is functional)

Seal Replacement:

📍 Seal Type: Dry run mechanical seal
⚠️ Shaft seal warranty: 3 months (part only)
⚠️ Replace seal at first sign of leakage from the seal plate area

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💨 Air Switch Operation

The WBH75 has a built-in pneumatic air switch — the same type used in the Vico WOW and Waterway Genesis pumps.

How it works:

1. An air button (sold separately) is mounted on the bathtub surface — typically on the rim or deck
2. 1/4″ air tubing (sold separately — 1/8″ ID × 1/4″ OD) connects the air button to the air switch nipple on the pump
3. Pressing the air button sends a puff of air through the tubing to the switch
4. The switch toggles the pump on or off — press once to start, press again to stop

What you need (sold separately):

• Air button (standard 1-3/4″ diameter, requires 1-3/8″ hole in tub deck)
• 1/4″ air tubing — available in 10-foot lengths or full rolls

💡 Tip: If the pump doesn’t start when first plugged in, the air switch may be in the “off” position from the factory. Press the air button once to activate.

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🎯 Ideal Applications

Application	Suitability	Notes
♨️ Small whirlpool / jetted bathtub	✅ Yes	Best for tubs with 4-6 jets
🛁 Jetted garden tub	✅ Yes	Standard residential installation
🛁 Massage armchair	✅ Yes	2-4 nozzle applications per LX specs
♨️ Hot tub / spa jet pump	❌ No	Not designed for continuous hot tub use
♨️ Spa circulation pump	❌ No	This is a jet pump, not a circ pump

💡 Sizing guide: The 0.5 HP WBH75 is suitable for smaller tubs with 4-6 standard jets. For tubs with 6-8 jets, consider the WBH100 (0.75 HP, 7.0A). For larger tubs with 8+ jets, consider the WBH150 (1.0 HP, 9.0A).

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🔄 LX WBH/WCH Bath Pump Family (Front/Top, Center Discharge)

Model (with cord / no cord)	HP	Amps	Input Power	Dimensions (L)	Replaces
WBH75 / WCH75 (this pump)	0.5 HP	5.0A	0.55 kW	12-7/16″	WOW 1050031 (0.5 HP, 5.5A)
WBH100 / WCH100	0.75 HP	7.0A	0.75 kW	13-3/16″	WOW 1050032 (3/4 HP, 7.5A)
WBH150 / WCH150	1.0 HP	9.0A	1.1 kW	14-3/16″	WOW 1051057 (1.0 HP, 9.0A)
WBH200	2.0 HP	—	—	—	Higher-power bath applications

All WBH models include NEMA cord + unions. All WCH models include unions but NO cord. All models share 1-1/2″ MBT connections, 5-1/4″ width, 6-15/16″ height, built-in air switch, self-draining design, UL/CSA certification, and 1-year warranty.

💡 Note: Each step up in the family adds approximately 3/4″ to 1″ in length due to the larger motor. Width (5-1/4″) and height (6-15/16″) remain the same across all models.

❓ Frequently Asked Questions

Q: What horsepower is this pump? A: The WBH75 is rated at 0.5 HP (1/2 HP) by Parts4Tubs and SpaCare with an input power of 0.55 kW and draws 5.0A. LX’s own model numbering convention (WBH”75″) suggests 0.75 HP. The amperage (5.0A) is consistent across all sources and is the most reliable matching spec.

Q: Will the LX WBH75 replace my Balboa Vico WOW 1050031 or 1010031? A: Yes — the WBH75 is widely used as a direct replacement for the Vico WOW 1050031/1010031. Both use 1-1/2″ MBT connections with the same center discharge / bottom suction configuration. The WBH75 draws 5.0A compared to the WOW’s 5.5A — it will work on the same circuit.

Q: Will this replace my Waterway Genesis 321FF10-0150? A: Yes — the WBH75 is commonly used to replace the Waterway Genesis 0.5 HP (5.5A) model. Both use the same 1-1/2″ MBT connection style. Verify physical clearance — the WBH75 is 12-7/16″ long.

Q: Does this pump include a power cord? A: The WBH75 includes a 3-foot NEMA cord with plug. The WCH75 model does NOT include a cord — you must reuse the cord from your old pump.

Q: Does this pump include unions? A: Yes — both the WBH75 and WCH75 include two 1-1/2″ unions with o-rings. Note that bath pump union designs vary by manufacturer — the included unions may require cutting off your old unions and installing the new ones with PVC cement.

Q: Is this pump big enough for my tub? A: The 0.5 HP WBH75 is designed for smaller jetted bathtubs with 4-6 jets. If your tub has more jets or you want stronger jet pressure, consider stepping up to the WBH100 (0.75 HP, 7.0A) or WBH150 (1.0 HP, 9.0A). Match by amperage of your existing pump for the best results.

Q: Do I need an air button? A: Yes — the pump has a built-in air switch but does not include an air button or air hose. You need a separate air button (mounted on the tub deck) and 1/4″ air tubing to connect it.

Q: What voltage does this pump require? A: 115V / 60Hz. This is standard US household voltage (110-120V). Plugs into a standard GFCI-protected outlet. Do not use on 230V circuits.

Q: Is this pump UL listed? A: Yes — the WBH75 is UL Recognized and CSA Certified with IPX4 protection rating and Class B insulation.

Q: How quiet is this pump? A: The WBH75 is the quietest pump in the LX WBH family due to its smaller 0.5 HP motor. LX’s air-cooled motor design with pure copper winding and anti-creep bearings is engineered for low noise and low vibration operation.

Q: How do I know if my pump needs replacing? A: Signs include unusual noise (grinding, screeching), water leaking from the seal area, reduced jet pressure, motor tripping the breaker, or failure to start.

Q: Do I need a GFCI breaker? A: Yes — GFCI protection is required by the National Electrical Code (NEC) for all whirlpool bath and spa installations.

🏆 Why Choose the LX WBH75

• ✅ Complete Package — Cord, unions, and air switch all included — no separate purchases needed
• ✅ Most Compact Option — At 12-7/16″ long, it fits where larger pumps won’t
• ✅ Whisper-Quiet Operation — Smallest motor in the family for minimal noise
• ✅ Cost-Effective Replacement — Significantly less expensive than Waterway Genesis and Balboa WOW pumps with comparable performance
• ✅ Proven Compatibility — Direct drop-in replacement for WOW 1050031/1010031 and Genesis 321FF10 series
• ✅ Quality Construction — Glass reinforced composite housing, dry run mechanical seal, pure copper winding motor
• ✅ UL & CSA Certified — Meets North American safety standards with IPX4 protection
• ✅ 1-Year Manufacturer Warranty — Backed by Guangdong Lingxiao, one of the world’s largest bath pump manufacturers

🤝 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
• ✅ Air buttons, air tubing, and compatible accessories available
• ✅ Dedicated customer service team

💧 Summary

The LX Lingxiao WBH75 is a 0.5 HP, 115V, 5.0A single-speed whirlpool bath pump — the most compact and quietest option in the LX bath pump family. It provides a complete, cost-effective replacement for Balboa Vico WOW 1050031/1010031 and Waterway Genesis 321FF10-0150 bath pumps. The package includes a 3-foot NEMA cord, two 1-1/2″ unions with o-rings, and a built-in air switch — everything needed for a straightforward installation. Ideal for smaller jetted bathtubs with 4-6 jets. UL Recognized and CSA Certified. Order today from Parts4Tubs for fast US shipping and expert support.