Item Type: Pressure Switch Model: LF56 Maximum Ambient Temperature: 66 Maximum Load: 15A 250VAC Maximum Diaphragm Pressure: 350psi Pressure Range: 20-300psi / 0.14-2.0MPa Pressure Difference Range: 20-50psi / 150-350kPa Interface Thread: NPT1/4-18 Contact Type: SPDT Contact Method: Single Pole Double Throw Diaphragm: Stainless Steel Interface: Brass Working Medium: Non corrosive medium such as air, water, oil, liquid, etc., and chlorine containing liquid is not available Ambient Temperature: -29~66 normal operation Medium Temperature: -40~180 without freezing1MULTIPLE USAGES: The pressure switch is suitable for pressure control, pressure limiting and alarming of non corrosive liquids, gases and steam. 2PRESSURE DETECTION: By detecting changes in pressure, changing the state of the internal switch to control the ON and OFF action of the external circuit. 3SPDT CONTACT TYPE: Single pole double throw contact method, can be used for boiler control and water tower pressure regulation system. 4WITH PLASTIC COVER: The pressure controller shell has a plastic cover, you can observe the pressure control point at any time. 5EXCELLENT MATERIAL: The pressure diaphragm is made of stainless steel, the pressure joint is made of brass, and the thread is NPT1/4?18. 1 x Pressure Switch 1 x User Manual