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This is a 95–125 PSI air compressor pressure switch, also referred to as a pressure control valve. It is designed with a single 1/4 inch female NPT air inlet located on the bottom of the switch. A manual on/off lever is built into the housing, along with a 1/4 inch compression unloader valve port on the side. If your system does not require an unloader, that connection can be left unused.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.