and SNR residential and commercial condensing models

It is only required for units manufactured prior to the Fall of 2004 that still utilize the original 4-pipe piping layout

The ASCO 8221G13 Solenoid Valve is a high-performance

When a call for heat is received at the TH terminal

Watts 0780318 Stem R-448A and SNR residential and commercialThe Watts 0780318 is a heavy duty 10 inch float valve stem engineered for high capacity water flow control in commercial, industrial, and agricultural environments. This genuine Watts KSTEM 11 series component is constructed from industrial grade brass, ensuring structural integrity in high temperature applications up to 9999 F. Featuring a 1 4" outside diameter (OD) and precision cut 1 4 20 NPT threaded ends, this stem provides a secure, rigid