This SPST (Single Pole Single Throw) switch is factory-calibrated to a -

it provides exact mechanical and electrical compatibility

The 5502-136M features a standard 2-1/8 inch "D" stem

making it compatible with a wide range of popular hydronic units including Weil McLain CGa Series 1 & 2

Warrick 3R4C0 4' Probe Els PW 17895 This SPST (Single Pole SingleThe Warrick 3R4C0 4' Probe is a high performance, 1 4" threaded electrode designed for precision conductive liquid level control in demanding industrial and commercial environments. Built from 316 stainless steel, this general purpose rod offers superior corrosion resistance, making it an ideal choice for boiler feedwater systems, process washers, and storage tanks. This metallic rod is engineered to screw directly into Warrick Series 3E, 3F, 3G, or