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Cast iron circulating pump coupler, cylindrical with splined ends

BELL AND GOSSETT

BELL AND GOSSETT 118705 Circulating Pump Coupler, Cast Iron

SKU CH-4C7V-TBRDP

Cast-iron coupler connects compatible Bell & Gossett in-line circulating pumps

  • Product typeDrain Components
  • Cast iron construction resists corrosion for long service life
  • Fits Bell & Gossett 100 NFI series in-line circulating pumps
  • Compatible with Grainger part numbers 4RC91 through 4RC96 and 4RD16 through 4RD17
  • Replaces manufacturer model numbers 100 BNFI, 102206, 102210, 102214, 106189 and HV BNFI
  • One-year manufacturer warranty included

BELL & GOSSETT 118705 Cast Iron Coupler

This BELL & GOSSETT 118705 circulating pump coupler is made from cast iron for durability. It fits in-line circulating pumps from the 100 NFI series family. Compatible manufacturer models include 100 BNFI, 102206, 102210, 102214, and 106189. The component connects the pump motor to the pump body securely.

Compatibility with Grainger and Series Parts

The coupler matches Grainger part numbers 4RC91, 4RC92, 4RC93, 4RC94, 4RC95, 4RC96, 4RD16, and 4RD17. It also suits the 102206, 102210, 102214, and 106189 manufacturer models. The 2 In. BNFI, HV BNFI, and PR AB series are supported. No spline count applies to this coupling design.

Cast Iron Construction for Pump Service

Cast iron material resists corrosion in hydronic heating and cooling loops. The one-year manufacturer warranty covers defects under normal pump operation. This part serves maintenance on existing 100 NFI series installations. Buyers needing couplers for other pump series or different materials should verify specifications before ordering.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 59% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameBell & Gossett
Model name118705
Product typeDrain Components

Questions about this item

How do I install the 118705 cast iron coupler onto my in-line circulating pump?

Align the coupler with the pump shaft and motor shaft, then secure it using the set screws provided; the step most often missed is tightening both set screws evenly so the coupler seats squarely on the shafts.

What maintenance or replacement will the 118705 cast iron coupler need over time?

Inspect the coupler annually for wear on the spline faces and for corrosion on the cast iron body; replace it if the splines show deformation or if the set screws no longer hold the shafts firmly.

What limit appears first when the 118705 coupler runs continuously in a hydronic system?

The cast iron material handles heat well, so the first limit is usually mechanical — the set screws can loosen under sustained vibration, causing the coupler to slip on the shafts.

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