unusual humming noises

Large 5/8" Orifice: Optimizes flow capacity (Cv) while maintaining tight shut-off capabilities in a normally closed configuration

With a 98-inch outside circumference and an AX section profile (1/2" top width)

preventing fouling and ensuring consistent performance in high-temperature environments up to 250°F

Installation Versatility: Straight-through 1/2 in

Crown Engineering 10010 Coupler 322838-754 unusual humming noisesThe Crown Engineering 10010 Coupler is a professional grade Spiralink pump coupler designed for high torque hydronic heating systems. Specifically engineered for 1 12 to 1 3 HP motors, it features a unique single spring spiral design that provides 3 dimensional flexibility to compensate for shaft misalignment between the motor and the pump head. Unlike older, multi part "fly away" couplings, this one piece HVAC pump coupling eliminates friction