McDonnell & Miller 310488 Switch Assembly Els PW 29614 this FNPT check valve provides

this FNPT check valve provides consistent performance in demanding fluid control layouts

or unexpected boiler modulation issues

System Longevity: Helps prevent compressor failure by ensuring only vaporized refrigerant returns through the suction line

Designed for reliable pressure monitoring and system safety

McDonnell & Miller 310488 Switch Assembly Els PW 29614 this FNPT check valve providesThe McDonnell & Miller 310488 is a field replaceable SWA 42S Snap Switch Assembly engineered specifically for Series 42S low water cut off and pump controllers. This single pole, single throw (SPST) mechanism provides precise automatic reset functionality, ensuring consistent boiler feed pump control and high limit safety across residential, commercial, and industrial steam applications. Built with a robust housing and high quality internal contacts,