Maxitrol M420B-1/2 Valve R-410A This HVAC replacement part is

This HVAC replacement part is built for technicians who require a reliable 4-way reversing valve that withstands high-pressure differentials and facilitates rapid temperature regulation in multi-season environments

keeping your 1" Spence regulator within OEM performance specs

protecting the unit from short-circuiting or staging errors

Key Benefits for Technicians: Precise 120V to 24V Conversion: Maintains stable secondary voltage for terminal strips and control modules

Maxitrol M420B-1/2 Valve R-410A This HVAC replacement part isThe Maxitrol M420B 1 2 is a professional grade modulating gas valve engineered for atmospheric burners and indirect fired heating systems. Designed specifically for integration with the Maxitrol Selectra Series 94 and A200 electronic modulation systems, this 1 2" NPT valve provides precise, infinite flame adjustment to maintain tight temperature tolerances. The "B" designation indicates that both sides are fitted for low fire adjustment, allowing