Air Horn SwitchHeavy Duty Pressure Switch; Tank Mount; 100 PSI On/130 PSI Off;FEATURES:Pressure Switch Regulates The Air Pressure In The Air TankPressure Switch Controls On/Off Function Of Air CompressorsAuto On/OffNote 5 Percent +/- ToleranceThe Use Of A Relay Is Recommended20 Amp Max LoadHeavy duty tank-mount pressure switch regulates the air pressure in your air tank. The pressure switch gets wired to the compressor and turns the air compressor on and off automatically.Kleinn automotive air horns offers complete air horn kits, train horns, roof mount truck horns, air systems kit accessories and off road lift kits.