As the direct updated version of the 626548

If the pilot flame is clean and hitting the probe but the valve won't hold

Oils from your hands can cause "hot spots" that lead to premature failure

The plastic cap protects the stainless steel pushpin during shipping and allows for manual flow adjustment during the initial system startup and balancing before the permanent operator is installed

For larger UV-2000 or UV-2023 air treatment systems

Robertshaw 4350-128 Gas Thermostat Els PW 17895 As the direct updated versionThe Robertshaw 4350 128 is a professional grade BJ Kit for Griddle systems, engineered for precise thermal management in demanding commercial kitchen environments. This combination gas cock and bypass thermostat provides a reliable temperature control range of 150F to 400F, ensuring optimal heat consistency for flat top surfaces. Designed as a high capacity commercial griddle thermostat, it supports up to 70,000 BTU HR, making it a versatile choice