What is the physical diameter of a #54 orifice

The 100165923 provides the precise flame sensing continuity required by the smart valve or control board to maintain the gas valve circuit

The kit integrates a high-performance SEN00491 flame sensor and a 120V White-Rodgers 50A55-486 ignition control board

supporting a system static pressure up to 400 psi and fluid temperatures between 32° and 200°F

McDonnell & Miller 63 Low Water Cut Off Freon What is the physical diameterThe McDonnell & Miller 63 Low Water Cut Off (Part Number 142400) is a heavy duty, float operated safety control designed for residential, commercial, and industrial boiler applications. This mechanical LWCO is specifically engineered for use with both hot water and steam boilers, providing a critical layer of protection against dry fire conditions. Featuring a 1" NPT threaded connection for equalizing pipes, it is rated for a maximum boiler pressure