This specific Alco T-Series valve utilizes a stainless steel power assembly to resist corrosion and prevent diaphragm fatigue

the 61-21368-16 is rated for up to 600 PSIG

the element should be "snaked" horizontally across the downstream side of the heating coil or upstream of the cooling coil

or obstructed pressure tubing

Which air handler models are compatible with the HKR-05C

McDonnell & Miller 310488 Switch Assembly THPU32HP7Y This specific Alco T-Series valveThe 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,