BELL AND GOSSETT
BELL AND GOSSETT 118709 Coupler Pump
Cast iron coupler connects in-line circulating pumps, compatible with PD37T series models 105089, 105097 and 501203
- TypeDrain Components
- Cast iron construction resists corrosion for long service life
- 1-year manufacturer warranty protects your investment
- Fits PD37T series in-line circulating pumps
- Replaces Grainger parts 2P611, 3P721, 3P724, 3P733, 4RD13, 4RD14
- Compatible with Bell & Gossett models 105089, 105097, 501203
Coupler Pump 118709
The Bell & Gossett 118709 coupler connects the motor shaft to the impeller on PD37T series in-line circulating pumps. It fits models 105089, 105097 and 501203 and replaces Grainger references 2P611, 3P721, 3P724 and 3P733. Maintenance teams use it to restore pump operation after the original coupling wears or shears.
Cast iron coupling under continuous duty
The cast iron body transmits torque between the motor and pump without flexible elements that fatigue over time. Because the design has no splines, alignment depends on the pump’s own register fits, so the coupler does not introduce backlash that grows with thermal cycling. In hydronic systems that run for months without shutdown, the material resists the corrosion and scale that degrade polymer or composite alternatives.
Direct replacement for PD37T pumps
The coupler mounts between the motor and pump volute using the existing bolt pattern, requiring no adapters or shims. Its dimensions match the original equipment for series PD37T, so pipework and supports stay unchanged during service. Installers should verify shaft diameter and keyway engagement before assembly, as the part is not universal across all Bell & Gossett circulating pumps.
Highlights
- Cast iron construction resists corrosion for long service life
- 1-year manufacturer warranty protects your investment
- Fits PD37T series in-line circulating pumps
- Replaces Grainger parts 2P611, 3P721, 3P724, 3P733, 4RD13, 4RD14
- Compatible with Bell & Gossett models 105089, 105097, 501203
Specifications
| Type | Drain Components |
|---|---|
| Brand | Bell & Gossett |
| Model | 118709 |
Questions about this item
Does the cast-iron coupler generate noticeable vibration or heat when the pump runs continuously?
The cast-iron construction dampens vibration and dissipates heat evenly during continuous in-line circulating pump operation.
Which pump models must I already own for the 118709 coupler to fit?
It fits Bell & Gossett in-line circulating pumps in the PD37T series family, including manufacturer model numbers 105089, 105097 and 501203.
Will this coupler work with the older Series PD37T pump I have kept in the system?
Yes, the coupler is compatible with the Series PD37T family, so it installs directly on those older in-line circulating pumps.
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