Brand new, SUNNY automatic pressure switch for compressed air systems. Automatically turns electric motor ON or OFF at set values. Adjustable differential. Unloader port 1/4\" OD copper tubing
which allows the compressor to start without back pressure load. Sturdy plastic housing. Manual off switch. Single port.
Product details at https://www.allaircompressorparts.com/sunny-l195-125psisingleportpressureswitchwonoffswitchandunloader25amp.aspx