this valve utilizes an equal percentage flow characteristic to provide stable modulating control in water or glycol systems

40" WC to ensure the combustion blower is operating at the correct RPM and vacuum pressure

Universal Field Replacement: Replaces over 400 competitive and legacy Resideo/Honeywell modules

Watch for loud grinding or screeching noises (bearing wear)

Mueller A17936 Check Valve 320819-301 this valve utilizes an equalThe Mueller A17936 is a professional grade 1 2" Magnetic Check Valve engineered for heavy duty refrigeration and air conditioning systems. Featuring a hermetically formed solid copper body, this valve ensures zero leak potential while maintaining structural integrity under high pressure conditions. Unlike traditional spring loaded variants, its magnetic closure mechanism provides a more positive seal with a significantly lower pressure drop, making it