Brand new Air Compressor Control Valve (140-175 PSI Pressure Switch). It is comparable to a Furnas, Square D, and many more. The product has an On/Off switch and an unloader. It will be working on both 2 stages and single stage compressors. If your compressor does not need the unloader, you do not have to hook it up. 

• PRESET 140-175 PSI
• ¼" COMPRESSION UNLOADER VALVE
• ¼" FEMALE NPT TANK CONNECTION WITH 3 EXTRA 1/4" PORTS.
• MAX AMPS, 20 AMPS AT 120VOLT / 12 AMP AT 240 VOLT , AND 9.6 AMP AT 3PH 240 VOLT