Aquatic 8078 MOTOR Replacement Pump | 3/4 HP, 120V
Aquatic 8078 MOTOR Replacement Pump | 3/4 HP, 120V
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Aquatic 8078 MOTOR Whirlpool Pump Replacement
Replace your discontinued Aquatic 8078 MOTOR or ITT Marlow Gemini Plus R75A-C whirlpool bathtub pump with this premium 3/4 HP replacement pump from Whirly Bros. Designed for many Aquatic and ITT Marlow whirlpool bath systems, this complete replacement restores strong hydrotherapy performance without the expense of replacing your entire bathtub.
If your original pump has become noisy, started leaking, seized, or stopped operating, this replacement delivers dependable performance, quiet operation, and long-lasting reliability using modern motor technology that helps save energy without sacrificing water flow.
- FREE Shipping in the USA on Orders $100+
- Same-Day Shipping Available on Most Orders
- Expert Help Identifying the Right Part
- Real Technical Support Before & After the Sale
- Trusted by Homeowners, Plumbers & Contractors
Quick Specifications
| Replacement For | Aquatic 8078 MOTOR / ITT Marlow Gemini PlusΒ |
| Product Type | Whirlpool Bathtub Pump |
| Horsepower | 3/4 HP |
| Voltage | 120V AC |
| Amperage | 8.5 Amps |
| Frequency | 50/60 Hz |
| Motor Speed | Single Speed |
| Air Switch | Built-In |
| Pump Unions | (2) Included |
| Air Switch Tubing | 6 ft Included |
| Application | Whirlpool Bathtub Systems |
| Condition | Brand New |
Why Choose This Replacement?
Modern Motor Technology
This replacement pump uses updated motor technology designed to operate more efficiently than many older OEM pumps while still delivering the strong water flow needed for proper whirlpool performance.
Modern efficiency does not mean weaker performance. This replacement is designed to maintain the jet pressure and water movement your whirlpool bathtub requires.
Complete Installation Kit Included
- (1) ITT Marlow Gemini Plus 3/4 HP Replacement Pump
- (2) Pump Unions
- (1) 6-Foot Air Switch Tubing
Common Signs Your Pump Needs Replacement
- Loud motor or bearing noise
- Water leaking from the pump seal
- Pump hums but will not start
- Weak jet pressure
- Motor overheating
- Pump repeatedly trips the GFCI
- Cracked or damaged wet end
- Reduced whirlpool performance
OEM Cross Reference
- Aquatic 8078 MOTOR
- ITT Marlow Gemini Plus with air switch
Installation Overview
- Disconnect electrical power.
- Drain the whirlpool bathtub.
- Remove the existing pump.
- Install the supplied pump unions.
- Reconnect plumbing.
- Attach the included air switch tubing.
- Restore power and test for leaks and proper operation.
Whirly Bros Expert Tip
We have replaced many Aquatic and ITT Marlow Gemini Plus pumps over the years. While this pump is a replacement for many Aquatic 8078 MOTOR and ITT Marlow Gemini PlusΒ Β applications, it is still important to verify your original pump label, voltage, amperage, plumbing orientation, and air switch configuration.
If you are unsure, send us a photo of your existing pump label and plumbing layout before ordering. Our team can help confirm compatibility so you receive the correct replacement the first time.
Modern motor technology provides excellent water flow while operating quieter, more efficiently, and producing less heat than many aging OEM motors.
Why Buy From Whirly Bros?
Whirly Bros specializes in whirlpool bathtub replacement partsβnot hot tubs or swimming pools. We help homeowners, plumbers, contractors, hotels, property managers, and service technicians identify discontinued pumps and replacement components every day.
- Expert product identification
- Whirlpool bathtub parts specialists
- Fast order processing
- Same-day shipping on most in-stock orders
- Free U.S. shipping on qualifying orders
- Friendly technical support before and after your purchase
Frequently Asked Questions
Is this a replacement for the Aquatic 8078 MOTOR?
Yes. This pump is commonly used as a premium replacement for the discontinued Aquatic 8078 MOTOR.
Does this replace the ITT Marlow Gemini Plus ?
Yes. It replaces many ITT Marlow Gemini PlusΒ whirlpool bathtub pumps.
What are the electrical specifications?
This pump is rated at 120V AC, 8.5 Amps, 50/60 Hz, and 3/4 HP.
Does this pump include unions?
Yes. Two pump unions are included.
Does it include air switch tubing?
Yes. A 6-foot length of air switch tubing is included.
Is the air switch built into the pump?
Yes. This pump includes a built-in air switch for operation with an air button.
Will this fit every Aquatic whirlpool bathtub?
No. Compatibility depends on your original pump label, plumbing layout, and air switch configuration.
Customers Also Purchase
- Whirlpool Tub Air Buttons
- Air Switch Tubing
- Pump Union Gaskets
- Whirlpool Tub Heaters
- Replacement Control Systems
- Whirlpool Tub Plumbing Fittings
- 5 stars: 6 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
Drop in replacement just as described. I had to go check out the whirley bros website for info on the air switch.
Thanks for taking your time to review. We appreciate your business π
Fit perfectly, easy to change out. Works great.
Thanks for taking the time to review
Jesse
They did what they said they were gonna do when they were gonna do very happy with my purchase
Thanks Randall, we appreciate your business and appreciate you taking the time to leave a review
Our 30-year old spa pump and heater were destroyed by flooding from Hurricane Helene. Trips to plumbing supply shops and pool/spa outfits were fruitless, but then I found Whirley Bros. They answered my questions and guaranteed the new pump would match the form, fit and function of the old. I ordered one, thinking "they're gonna get me on shipping", nope, if you're not in a hurry, free is an option. I had to pull the guts out of the heater and pot the openings with waterproof epoxy and silicone, but after almost a year, we have a whirlpool spa again! Great company.
Thanks for the kind words, we due our best to make sure customers get the right part everytime. We appreciate your business, if you need anything give us a call.
Jesse Paredes
Purchased this pump for a 30 year old jacuzzi tub and it fit perfectly, works perfectly, and was priced lower than anywhere else I found online. Shipping was very fast. I'm very pleased with this purchase.
We are very impatient when we order parts for our own projects and so we do our best to make sure we ship same day to avoid any delays. Thats our golden rule.
Thanks for your business.
Haven't installed it yet, but do appreciate your prompt response to my order. I'll let you know when I install it an get it operating.
Hi James, thank you for your kind words! Weβre glad to hear you appreciated the prompt service. Looking forward to your update once you install and get it running.