Supco Part number SHP550450 Open: 550 PSI Close: 450 PSIHigh pressure switch opens on pressure rise High precision controls at economical prices. Encapsulated, non-adjustable, single pole - single throw, direct mount switches for use with HFC, HCFC, and CFC refrigerants Features: ¼" SAE 45 female flare fitting with valve core depressor High pressure switch opens on pressure rise Life at rated load: 100,000 cycles Automatic Reset Rated Voltage 24/120/240 VAC @ 50/60 Hz Snap acting stainless steel hermetically sealed sensor Wire is 18 AWG, 18" long Small size and light weight for direct mounting Excellent set point repeatability/stability Specifications: -31F to 149F (-35C to 65C) UL Recognized, CE Max Pressure 700PSI