This is a standing pilot gas valve specifically designed to work with a 30 millivolt thermocouple

ensure the valve meets the specific code requirements of your local jurisdiction

Which legacy models does the 21-933-1 cover replace

50" WC PF and a Low of 0

Hydrolevel 450 Low Water Cut-Off Els PW 17895 This is a standing pilotThe Hydrolevel 45 450 Safgard 450 is a professional grade 120V low water cut off for steam boilers engineered for direct mount residential and light commercial applications. Utilizing a solid state EL1214 sensing probe, this non cycling control ensures precise monitoring without the mechanical failures typical of float style devices. It features a technical 15 second burner off delay to compensate for momentary water level fluctuations and surging,