Mueller Industries A17939 Check Valve L99H008 typically powered by an SPDT

typically powered by an SPDT snap-acting switch

allowing for proactive maintenance before acid formation damages the compressor

If the millivolt output drops below the required threshold

including high-pressure R-410A and POE/PAG oils

This 120Vac solenoid features a 1/4" NPT connection and a robust brass body

Mueller Industries A17939 Check Valve L99H008 typically powered by an SPDTThe Mueller Industries A17939 is a high performance 7 8" Magnetic Check Valve designed for critical backflow prevention in commercial refrigeration and air conditioning systems. Engineered with a hermetically formed solid copper body, this valve eliminates potential leak paths, ensuring system integrity under high pressure conditions up to 800 PSI (55 bar). The internal magnetic mechanism provides a positive seal with a minimum pressure differential