ITT Marlow Gemini Plus R100A-C Pump Replacement | 1 HP 120V Air Switch
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Restore strong, dependable whirlpool performance with the ITT Marlow Gemini Plus R100A-C Whirlpool Pump Replacement. This 1 HP, 120V bath pump is designed as a replacement for discontinued Gemini Plus and Hydro Air whirlpool pump applications that use a built-in pneumatic air switch.
The R100A-C is a practical solution for homeowners, technicians, and repair professionals replacing an older ITT Marlow or Gemini Plus pump without rebuilding the entire whirlpool system. Its compact bath-pump design, integrated air switch, and included power cord help simplify installation while preserving the original on-and-off operation of the tub.
Why Choose the R100A-C Gemini Plus Pump?
- Replacement for discontinued ITT Marlow pumps: Designed for many older Gemini Plus and Hydro Air whirlpool bath systems where the original pump is no longer available.
- 1 HP performance: Provides dependable water circulation and strong jet action for compatible whirlpool bathtubs.
- 120V operation: Built for standard residential whirlpool bath electrical systems.
- Built-in air switch: Allows the pump to operate with an existing pneumatic air button when properly connected.
- Power cord included: Arrives with a factory-installed cord for a cleaner, more convenient installation.
- Compact bath-pump design: Engineered for whirlpool tubs where space inside the equipment cavity may be limited.
- Expert replacement support: Whirly Bros can help compare your original pump label, amperage, plumbing orientation, and control method before ordering.
R100A-C Pump Specifications
| Model | R100A-C |
| Brand Family | ITT Marlow / Gemini Plus / Hydro Air |
| Application | Whirlpool bathtub and jetted tub pump replacement |
| Motor Rating | 1 HP |
| Voltage | 120V |
| Frequency | 50/60 Hz |
| Amperage | 8.5A |
| Speed | Single-speed |
| Control | Built-in pneumatic air switch |
| Power Cord | Included |
What Is Included?
- R100A-C 1 HP whirlpool bath pump
- Built-in pneumatic air switch
- Factory-installed power cord
- Replacement connection components as shown in the product images
Compatibility and Fitment
The R100A-C is commonly used as a replacement for older ITT Marlow Gemini Plus, Hydro Air, and related whirlpool bath pumps with similar electrical specifications, plumbing orientation, and air-switch operation.
Because manufacturers often used different pump configurations across tub models and production years, the model number alone should not be the only factor used to confirm compatibility.
Before ordering, compare the following information from your original pump:
- Original model and part number
- Voltage and amperage
- Horsepower rating
- Suction and discharge position
- Plumbing connection size
- Built-in air switch or external control configuration
- Available installation space
Important Installation Notes
Installation should be performed by a qualified technician or a person familiar with whirlpool bath electrical and plumbing systems. Always disconnect electrical power before servicing the tub.
Do not operate the pump without water. Running a whirlpool bath pump dry may damage the seal, impeller, or motor assembly.
Replacement pumps may have minor differences in housing shape, cord position, or plumbing alignment compared with an older discontinued pump. Small plumbing adjustments may occasionally be required depending on the original installation.
Frequently Asked Questions
Is the original ITT Marlow R100A-C discontinued?
Many original ITT Marlow and Gemini Plus bath pumps are no longer produced under their original labels. This pump is offered as a replacement solution for compatible R100A-C applications.
Does this pump include an air switch?
Yes. The pump includes a built-in pneumatic air switch designed to work with a compatible air button and air tubing.
Does the R100A-C include a power cord?
Yes. A factory-installed power cord is included.
Is this pump variable-speed?
No. This configuration is intended for single-speed operation. Variable-speed systems may require a different pump and control package.
Can this replace every Gemini Plus pump?
No. Gemini Plus pumps were produced in several horsepower ratings, amperages, plumbing layouts, and control configurations. Always verify the original pump specifications before ordering.
How can I confirm that this pump fits my tub?
Send Whirly Bros a clear photo of the original pump label, plumbing connections, and the surrounding installation area. We can help compare the important specifications before you place your order.
Why Buy from Whirly Bros?
- Free U.S. shipping on orders over $100
- Most orders ship the same business day
- Expert help identifying discontinued whirlpool bath parts
- Phone and text support before ordering
- Specialized experience with ITT Marlow, Gemini Plus, Hydro Air, Balboa, Kohler, American Standard, and other bath-system components
Need help confirming compatibility? Call or text Whirly Bros at (951) 897-1878 before ordering. Photos of the original pump label and plumbing connections are strongly recommended.
Compatibility information is provided as a general reference. Always verify voltage, amperage, plumbing size, port orientation, control method, and available space before installation.
