Key Benefits Direct Compatibility: Built to serve as the exact functional 1:1 replacement for HH22UC034

Stable Flame Rectification: Provides high-sensitivity feedback to the control module for accurate flame monitoring

the counter-balanced arm must be carefully adjusted to offset the natural gravity of the damper blade

Integrated Dual Aux Switches: Factory-installed SPDT switches eliminate the need for external add-ons to confirm damper position

This genuine York replacement part features a high-grade diaphragm and resilient casing to withstand the thermal stress of residential and light-commercial applications

McDonnell & Miller 51-S Feeder Freon Key Benefits Direct Compatibility: BuiltThe McDonnell & Miller 51 S (Part Number 135600) is a heavy duty mechanical water feeder designed specifically for high capacity steam and hot water boilers. Engineered for systems with a maximum vessel pressure of 35 PSI and a maximum water supply pressure of 100 PSI, this unit provides a reliable proportional feed action to maintain optimal water levels without the hunting common in electronic setups. It features 1" NPT connections for high flow