Proven Cast Iron construction with set screw and heavy duty springs
If you are replacing the pump it is a good idea to renew the coupling.
Replacement Assembly Coupling 118473 or PDZ12291 suitable for Bell & Gossett Series 60 and Armstrong 810120-003 designed for H51, H52 Circulator Pumps.
1/2" x 1/2" Yoke Style, Connects Motor and Bearing Assembly.