1/2" to 3/4" SAE flare connection for tubing and 1/2" to 3/4" male threads (MPT) for the tank. Has optional 1/8" hole on hex section for connecting to unloader valve on pressure switch. Check valves control the flow of air into the receiver tank. When the compressor reaches unload pressure the check valves closes, preventing the backflow of air from the receiver tank into the discharge supply line.
This is a very common connection in fluid power applications. Both the male and female fittings have 37 degree seat. The seal takes place between the male flare and female cone seat. The threads hold the connection mechanically.
Where is my check valve located?
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1/4" x 50 Ft Noodle Air Hose with Coupler and Plug