Single Port Air Compressor Pressure Switch Control Valve 145-175 PSI w/ Unloader

145-175 PSI air compressor pressure switch or known as a pressure control valve. This switch has one port on the bottom for air inlet hook up, which is 1/4" female NPT. This switch is also equipped with an on and off lever and an unloader valve on the side, which is 1/4" compression if the unloader is not needed it does not need to be hooked up.  This has a 1/4" Female NPT Pipe threads which can be changed to male using a pipe nipple from a local hardware store. For technical specifications please see below. Specifications: • Air Inlet - 1/4" Female NPT Pipe Threads• Unloader Size: 1/4" Compression• Equipped with a Manual On and Off Lever• Pressure Setting: Turns on at 145 PSI and Shuts off at 175 PSI.  (Can be adjusted slightly) Power and Amp Rating: • 20 Amps MAX at 120 Volt• 12 Amps MAX at 240 Volt Single Phase• 9.6 Amps MAX at 240 Volt 3 Phase 12 Volt Power DC • 8.6 AMPS at 32 Volts DC,• 3.1 AMPS at 120 Volt DC• 1.6 AMPS at 240 Volt DC If you have a larger industrial compressor with a magnetic starter, the amps do not matter.  All the switch is doing is telling the starter when to Turn on and Shut Off.