Hadley Check Valve

Check valve for Hadley air sets. Also called a non-return valve, check valve, or backflow preventer.
This right-angle check valve has a 7/16 male thread for connection to the reservoir. A 1/4-inch hose must be used for the supply from the compressor.

A check valve is used to allow air to flow into the reservoir (tank). However, the valve closes in the opposite direction. This means that air can flow in, but cannot flow back out.