Mueller Industries A17939 Check Valve 319847-401 Features a 1-3/8" ODF extended

Features a 1-3/8" ODF extended copper connection to prevent seal damage during soldering

2-pole definite purpose contactor designed for high-cycle reliability in residential and light commercial HVAC applications

By maintaining strict electrical continuity only under specific vacuum thresholds

This genuine OEM Temperature and Pressure Relief Valve is engineered for heavy-duty commercial applications

The extended copper stubs facilitate ease of installation by allowing technicians to braze without disassembling the internal components

Mueller Industries A17939 Check Valve 319847-401 Features a 1-3/8" ODF extendedThe 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