💧 Little Giant 6-CIM-R “Big John” Submersible Sump Pump – 1/3 HP, 46 GPM, 25-Ft Cord

Heavy-duty cast iron sump pump delivering powerful dewatering performance in a compact 6-inch profile

♨️ Product Overview

The Little Giant 6-CIM-R (Part No. 506274), known as the “Big John,” is a 1/3 HP submersible sump pump from the iconic 6-Series lineup manufactured by Little Giant, a division of Franklin Electric. This continuous-duty rated pump delivers an impressive 46 GPM (2,760 GPH) at 5 feet of lift with an 18-foot maximum shut-off head, making it a consistent top performer for residential and light commercial dewatering applications.

Built with an epoxy-coated cast iron motor housing and an oil-filled shaded pole motor, the 6-CIM-R provides lifetime lubrication and rapid heat dissipation for reliable, extended service life. The pump stands just 6 inches tall, allowing it to fit and operate inside a standard 5-gallon bucket — ideal for shallow sump pits, crawlspaces, transformer vaults, loading docks, and elevator pits where space is limited. The polycarbonate cover and polypropylene volute base provide additional corrosion resistance, while the nitrile, carbon, and ceramic mechanical shaft seal ensures dependable protection against water intrusion.

This 506274 model is the manual (no switch) version with a 25-foot power cord. It includes a 1-1/2 inch FNPT discharge, a 1-1/4 inch FNPT reducer bushing, and a 3/4-inch garden hose adapter for versatile connection options. For automatic sump operation, a piggyback diaphragm switch (RS-5 series) can be purchased separately and easily attached. The pump handles liquid temperatures up to 140°F (60°C) and is cCSAus listed for the USA and Canada.

✨ Key Features

✅ 1/3 HP Oil-Filled Shaded Pole Motor – Provides lifetime lubrication and rapid heat dissipation through the cast iron housing with thermal overload protection for safe continuous duty operation

✅ 46 GPM at 5 Feet of Lift – Moves 2,760 gallons per hour at 5-foot head with a maximum shut-off of 18 feet (7.8 PSI) for powerful dewatering and water transfer

✅ Ultra-Compact 6-Inch Profile – Fits and operates inside a standard 5-gallon bucket; ideal for shallow sumps, crawlspaces, and tight installations

✅ Epoxy-Coated Cast Iron Housing – Corrosion and rust resistant motor housing built for long-term durability in wet environments

✅ Non-Clog Vortex Style Nylon Impeller – Engineered to reduce clogging and maintain consistent flow performance

✅ Mechanical Shaft Seal – Stainless steel spring with nitrile parts, carbon, and ceramic faces for maximum protection against pump failure

✅ 140°F Maximum Liquid Temperature – Handles hot water applications including spa and hot tub draining without temperature concerns

✅ 25-Foot Power Cord – Extra-long cord for flexible positioning in deep basements, crawlspaces, and remote installations

✅ Multiple Discharge Adapters Included – 1-1/2″ FNPT main discharge plus 1-1/4″ FNPT reducer bushing and 3/4″ garden hose adapter

✅ Stainless Steel Hardware – Screws, bolts, and carry handle resist corrosion for extended service life

✅ Upper and Lower Sintered Sleeve Bearings – Dual bearing design extends motor life and ensures smooth, reliable operation

✅ cCSAus Listed / SSPMA Certified – Third-party safety certified for use in the USA and Canada with industry performance certification

🔩 Technical Specifications

Specification	Value
Manufacturer	Little Giant (Franklin Electric)
Model	6-CIM-R (“Big John”)
Part Number	506274
Series	6 Series Sump Pump
Pump Type	Submersible Sump Pump
Motor Type	Shaded Pole, Oil-Filled
Horsepower	1/3 HP
Voltage	115V
Frequency	50/60 Hz
Phase	Single
Running Amperage	9.0 A
Starting Amperage	14.3 A
Wattage	720W
Flow Rate (at 5 ft)	46 GPM (2,760 GPH)
Flow Rate (at 10 ft)	29 GPM (1,740 GPH)
Flow Rate (at 15 ft)	12.5 GPM (750 GPH)
Shut-Off Head	18 ft (5.5 m / 7.8 PSI)
Maximum Liquid Temperature	140°F (60°C)
Discharge Port	1-1/2″ FNPT
Reducer Bushing (included)	1-1/4″ FNPT
Garden Hose Adapter (included)	3/4″ GHT
Impeller	Nylon (non-clog vortex style)
Motor Housing	Epoxy-Coated Cast Iron
Cover	Polycarbonate
Volute Base	Polypropylene
Motor Shaft Seal	Mechanical (SS spring, nitrile, carbon/ceramic faces)
Bearings	Upper and lower sintered sleeve
Hardware	Stainless steel screws, bolts, and handle
Inlet	Screened
Minimum Sump Diameter	11″ (for manual; 10″ with piggyback switch)
Cord Length	25 ft
Pump Height	6″
Dimensions (L × W × H)	9.5″ × 8.5″ × 6″
Weight	19.0 lbs
Operation	Manual (no switch — switch sold separately)
Duty Rating	Continuous
Motor Protection	Thermal Overload (automatic reset)
Certifications	cCSAus Listed, SSPMA Certified
Warranty	3 Years

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⚡ Electrical Requirements

Electrical Spec	Requirement
Supply Voltage	115V
Frequency	50/60 Hz
Phase	Single
Running Amps	9.0 A
Starting Amps	14.3 A
Wattage	720W
Cord Length	25 ft
Cord Type	3-prong grounded plug

⚠️ IMPORTANT:

All electrical connections must comply with the National Electrical Code (NEC) and all applicable local codes and regulations. The pump must be plugged into a properly grounded outlet matching the 3-prong grounding plug.

GFCI (Ground Fault Circuit Interrupter) protection is required for all sump pump, pool, spa, and outdoor water installations per NEC requirements.

A dedicated circuit is recommended. Do not share the circuit with other appliances. The starting amperage of 14.3A should be considered when sizing the circuit breaker.

This is a manual pump — it does not include an automatic switch. When used in a sump pit, a piggyback switch (sold separately) is recommended for automatic operation. The pump must be monitored during manual use to prevent dry running.

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📊 Performance Curve Data

Lift Height	Flow Rate (GPM)	Flow Rate (GPH)
0 ft	See manufacturer curve	See manufacturer curve
5 ft	46.0	2,760
10 ft	29.0	1,740
15 ft	12.5	750
18 ft (shut-off)	0	0

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🔗 Compatibility Guide

This Pump:

📍 Discharge: 1-1/2″ FNPT (main) 📍 Reducer Bushing: 1-1/4″ FNPT (included) 📍 Garden Hose Adapter: 3/4″ GHT (included) 📍 Voltage: 115V / 50/60 Hz 📍 Minimum Sump Diameter: 11″ (manual) / 10″ (with piggyback switch)

Discharge Connection Options:

The 1-1/2 inch FNPT main discharge accepts standard 1-1/2 inch male NPT pipe, PVC adapters, or check valves for permanent sump installations. The included 1-1/4 inch FNPT reducer bushing allows connection to 1-1/4 inch discharge pipe, and the 3/4-inch garden hose adapter enables direct connection to a standard garden hose for portable water transfer applications.

Related 6-Series Models:

Part Number	Model	Cord	Voltage	Switch Type
506274	6-CIM-R (this pump)	25 ft	115V	Manual
506271	6-CIM-R	10 ft	115V	Manual
506158	6-CIA	10 ft	115V	Integral Diaphragm (Auto)
506125	6-CIA	25 ft	115V	Integral Diaphragm (Auto)
506164	6-CIA	25 ft	115V	Integral Diaphragm (Auto) + Leg Kit
506267	6-CIA-RS	10 ft	115V	Piggyback Diaphragm (Auto)
506171	6-CIA-RFS	10 ft	115V	Piggyback Mechanical Float (Auto)
506266	6-CIM	12 ft	230V	Manual
506166	6-CIA	10 ft	230V	Automatic Diaphragm
506257	6-CBM	10 ft	115V	Manual (Cast Bronze)

Recommended Accessories:

Accessory	Description
RS-5 / RS-5-LL	Piggyback diaphragm switch for automatic operation (sold separately)
Leg Kit	PVC leg kit to elevate pump off basin bottom
SA-1	Sacrificial anode for additional corrosion protection
Check Valve	1-1/2″ check valve for sump discharge line (prevents backflow)
Pump Base	Little Giant pump base (replacement part)

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🛠️ Installation Requirements

Sump Pit Installation:

Requirement	Specification
Positioning	Fully submerged in sump pit
Minimum Sump Diameter	11″ (manual) / 10″ (with piggyback switch) / 18″ (with float switch)
Pump Height	6″ — fits inside a standard 5-gallon bucket
Discharge	1-1/2″ FNPT (vertical or to side)
Mounting	Place on flat, level surface at bottom of sump pit

Plumbing Connections:

Connection	Size
Main Discharge	1-1/2″ FNPT
Reducer Bushing	1-1/4″ FNPT (included)
Garden Hose Adapter	3/4″ GHT (included)

Installation Notes:

⚠️ This pump is for submersible use only. It must be fully submerged during operation. Do not operate above water level.

⚠️ Manual operation — this pump does not include an automatic switch. For sump pit use, a piggyback diaphragm switch (RS-5 series, sold separately) is strongly recommended for automatic operation.

⚠️ A check valve should be installed on the discharge line for sump pit installations to prevent backflow when the pump cycles off.

⚠️ Ensure GFCI protection is installed per NEC requirements. The pump must be connected to a properly grounded outlet.

⚠️ The optional PVC leg kit can be used to elevate the pump slightly off the basin bottom, helping to prevent debris from entering the pump intake.

⚠️ Do not pump flammable, explosive, or corrosive liquids. The oil-filled motor contains mineral oil; if seals are compromised, oil may discharge into the water.

⚠️ Not recommended for continuous recirculation in fish ponds or water features. Running a sump pump continuously in recirculation applications can cause overheating, and if seals fail, motor oil could contaminate the water. This type of use will void the warranty.

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🔄 Maintenance Guide

Routine Maintenance:

Task	Frequency	Notes
Test pump operation	Monthly	Pour water into sump to activate pump and verify proper discharge
Inspect discharge line	Monthly	Check for leaks, blockages, or frozen sections
Clean intake screen	Quarterly	Remove debris buildup from screened inlet
Inspect check valve	Quarterly	Ensure valve opens and closes freely
Verify GFCI function	Monthly	Test GFCI outlet or breaker per manufacturer instructions
Clean sump pit	Annually	Remove sediment, gravel, and debris from pit
Inspect power cord	Quarterly	Check for damage, cuts, or exposed wiring
Check stainless steel hardware	Annually	Tighten handle, bolts, and screws if loose

Warning Signs — Service or Replace Pump If:

• Motor fails to start or hums without pumping
• Unusual noise (grinding, rattling, or screeching)
• Water leaking from shaft seal area
• Reduced flow rate despite clear intake
• Motor trips circuit breaker repeatedly
• Excessive vibration during operation
• Motor oil visible in sump water (indicates seal failure)
• Pump cycles on and off rapidly (short cycling)

Shaft Seal Information:

📍 Seal Type: Mechanical — stainless steel spring, nitrile parts, carbon and ceramic faces 📍 Oil-filled motor is factory sealed — no user-serviceable motor lubrication ⚠️ If oil is observed in the sump water, the seal has failed and the pump should be replaced

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🎯 Ideal Applications

Application	Suitability	Notes
💧 Basement sump pit	✅ Yes	Primary designed application; add switch for auto operation
💧 Crawlspace dewatering	✅ Yes	6-inch profile fits shallow spaces; 25-ft cord reaches remote areas
💧 Hot tub / spa draining	✅ Yes	140°F max temp handles hot water; 46 GPM drains quickly
💧 Pool cover water removal	✅ Yes	Powerful 2,760 GPH removes standing water rapidly
💧 Water transfer / dewatering	✅ Yes	Continuous duty rated for extended transfer operations
💧 Elevator pit drainage	✅ Yes	Compact profile fits tight elevator pit sumps
💧 Transformer vault	✅ Yes	Cast iron construction handles industrial environments
💧 Loading dock drainage	✅ Yes	Powerful flow handles high-volume water removal
💧 Emergency flood water removal	✅ Yes	Manual operation provides immediate response
🔄 Fish pond / water feature recirculation	❌ No	Continuous recirculation voids warranty; oil seal risk
♨️ Spa jet pump	❌ No	Not designed for jet pump applications

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❓ Frequently Asked Questions

Q: What is the horsepower of this pump? A: The Little Giant 6-CIM-R (506274) is rated at 1/3 HP with an oil-filled shaded pole motor operating at 115V/50-60Hz, drawing 9.0 amps running and 14.3 amps starting.

Q: Is this pump automatic or manual? A: The 6-CIM-R (506274) is a manual pump — it does not include an automatic switch. For automatic sump operation, purchase a piggyback diaphragm switch (RS-5 series) separately, which easily attaches to the pump cord. Alternatively, choose the 6-CIA model (506158 or 506125) which includes an integral diaphragm switch.

Q: How much water can this pump move? A: At 5 feet of lift, the pump delivers 46 GPM (2,760 GPH). At 10 feet, it delivers 29 GPM (1,740 GPH). At 15 feet, it delivers 12.5 GPM (750 GPH). Maximum shut-off head is 18 feet (7.8 PSI).

Q: Can I use this pump to drain my hot tub or spa? A: Yes. The 6-CIM-R handles liquid temperatures up to 140°F (60°C), which is well above typical hot tub operating temperatures. The 46 GPM flow rate will drain most hot tubs rapidly.

Q: What size sump pit does this pump require? A: The minimum sump diameter is 11 inches for manual operation, 10 inches when used with a piggyback diaphragm switch, or 18 inches when used with a float switch.

Q: How tall is this pump? A: The 6-CIM-R stands just 6 inches tall and can fit and operate inside a standard 5-gallon bucket, making it ideal for shallow sump pits and tight installations.

Q: What size pipe does the discharge connect to? A: The main discharge is 1-1/2 inch FNPT. The pump includes a 1-1/4 inch FNPT reducer bushing and a 3/4-inch garden hose adapter for additional connection flexibility.

Q: What is the difference between the 506271 and 506274? A: Both are the same 6-CIM-R manual pump. The 506271 has a 10-foot cord, while the 506274 (this pump) has a 25-foot cord for installations requiring greater reach.

Q: Do I need a check valve? A: Yes, a check valve is strongly recommended for all sump pit installations. It prevents water in the discharge line from flowing back into the sump pit when the pump turns off.

Q: Is the motor user-serviceable? A: No. The motor is oil-filled and factory sealed. There is no user-serviceable lubrication. If oil appears in the sump water, the seal has failed and the pump should be replaced.

Q: How heavy is this pump? A: The 6-CIM-R weighs 19 pounds. It includes a stainless steel carry handle for transport.

Q: Do I need GFCI protection? A: Yes. GFCI protection is required by the National Electrical Code (NEC) for all sump pump installations and any pump used in pool, spa, hot tub, or outdoor water applications.

📥 Downloads & Resources

📄 6 Series Sump Pump Spec Sheet – Complete specifications, performance curves, and dimensions

📄 6 Series Sump Pump Installation Manual – Installation instructions, wiring, troubleshooting, and maintenance

🏆 Why Choose the Little Giant 6-CIM-R “Big John”

✅ Proven 80-Year Heritage – Little Giant (Franklin Electric) has been the trusted name in water pumps for over eight decades, used by homeowners and professionals worldwide

✅ Powerful 46 GPM Performance – Moves 2,760 gallons per hour at 5 feet of lift with an 18-foot maximum head — significantly outperforms typical utility pumps

✅ Ultra-Compact 6-Inch Profile – Fits in a 5-gallon bucket and operates in the shallowest sump pits where larger pumps cannot

✅ Cast Iron Durability – Epoxy-coated cast iron motor housing provides far superior strength, heat dissipation, and longevity compared to plastic or aluminum alternatives

✅ Oil-Filled Motor Technology – Lifetime lubrication with rapid heat dissipation for cool, quiet, extended operation

✅ 140°F Liquid Temperature Rating – Handles hot water from spa draining, laundry systems, and industrial applications without temperature restrictions

✅ Versatile Discharge Options – Three connection sizes included (1-1/2″, 1-1/4″, 3/4″ garden hose) for maximum installation flexibility

✅ 3-Year Manufacturer Warranty – Industry-leading warranty backed by Franklin Electric’s nationwide support network

🤝 Why Buy From Parts4Tubs

✅ Fast shipping across the United States

✅ Expert advice from pool, spa, and water equipment specialists

✅ Competitive pricing

✅ Full warranty support

✅ Hassle-free returns

✅ Replacement seals, switches, and accessories available

✅ Dedicated customer service team

⭐ Summary

The Little Giant 6-CIM-R “Big John” (506274) is a 1/3 HP continuous-duty submersible sump pump delivering 46 GPM (2,760 GPH) at 5 feet of lift with an 18-foot maximum shut-off head. Built with an epoxy-coated cast iron housing, oil-filled shaded pole motor, stainless steel hardware, and carbon/ceramic mechanical shaft seal, this 19-pound pump stands just 6 inches tall and fits inside a 5-gallon bucket. Featuring a 1-1/2 inch FNPT discharge with included reducer and garden hose adapter, 25-foot cord, 140°F temperature rating, and cCSAus certification with a 3-year warranty. Perfect for sump pits, hot tub draining, crawlspace dewatering, and emergency water removal. Order today from Parts4Tubs for fast US shipping and expert support.

 

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.