The B&G 118709 Coupler

Bell & Gossett 118709 Coupler – OEM Shaft Coupling for PD-Series Hydronic Circulator Pumps

The Bell & Gossett 118709 coupler is an OEM replacement shaft coupler designed for use with select circulator pumps, including PD-35, PD-37, and 60-AA Series. This coupler ensures secure and precise connection between the electric motor and pump impeller assembly, enabling smooth, efficient operation of the circulator in hydronic heating and cooling systems.

Constructed to OEM specifications, the 118709 coupler provides durability and consistent performance over the life of the pump. It is ideal for maintenance, retrofit, or repair tasks where the existing coupler has worn, failed, or needs replacement to restore proper pump function.

Features

• Bell & Gossett 118709 OEM coupler
• Designed for PD-35, PD-37, and 60-AA series circulator pumps
• Ensures secure mechanical coupling between motor and pump shaft
• Durable construction for long-term reliability
• OEM spec part — guaranteed fit and performance
• Suitable for hydronic, HVAC, and boiler circulation systems
• Essential maintenance or replacement part for recirculating pumps

Benefits & Applications

• Restores proper mechanical connection in hydronic circulators
• Reduces vibration, noise, and premature wear from worn couplings
• OEM part ensures compatibility and long service life
• Ideal for service technicians, contractors, and facility maintenance teams
• Helps maintain system efficiency by ensuring consistent pump operation
• Suitable for residential and commercial hydronic systems

Technical Specifications

Applications

• PD-35 circulator pump shaft replacement
• PD-37 pump coupling repair
• 60-AA circulator pump coupling replacement
• Hydronic heating and chilled water circulation systems
• Service and maintenance of HVAC circulators

Always verify your pump series and model before ordering replacement parts to ensure compatibility.

Installation & Use Notes

• Installation should be performed by a qualified HVAC or pump technician.
• Disconnect power and drain system before servicing a circulator pump.
• Remove old coupler carefully to avoid damage to motor or pump shaft.
• Install the new coupler to ensure proper seating and alignment.
• After installation, test pump operation to confirm smooth coupling and vibration-free rotation.
• Follow all applicable mechanical and safety codes for hydronic equipment maintenance.

Why Buy from APEX Controls

• OEM Bell & Gossett replacement coupler — no substitutes
• Designed for dependable performance and long service life
• Ideal for professional HVAC and hydronic maintenance teams
• Ensures pump system efficiency and reliability
• Trusted parts supplier for contractors and facility engineers