Pump Shaft Coupler for Hydronic Circulator Pumps, 1/2 x 1/2 In

This 1/2 x 1/2-inch pump shaft coupler is designed for use in 1/4- and 1/3-HP hydronic booster and circulating pump systems, providing a critical mechanical connection between the motor shaft and the pump shaft. It helps maintain proper alignment and ensures efficient power transfer, supporting consistent pump operation in heating and HVAC applications. Engineered as a spring-type coupler, it is commonly used in Series 2-1/2, LD-3, and HD-3 pump assemblies as well as compatible legacy units. This component is frequently replaced during maintenance when shaft misalignment occurs, making it a practical solution for service technicians working to restore pump performance and extend equipment life.

• 1/2 x 1/2 inch size
• Spring-type design
• Constructed from cast iron
• Connects motor shaft to pump shaft
• Compatible with Series 2-1/2, LD-3, and HD-3 pumps
• Supports alignment and power transfer in circulator pump systems
• Common replacement part for servicing worn or damaged pump couplings in hydronic systems
• Repairs B&G models: 2-1/2 Inch AB, 2-1/2 Inch BI, 2-1/2 Inch IB, HD3 AB, HD3 BI, HD3 IB, LD3 AB, LD3 BI, LD3 IB