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Relief Valve NH3 Pressure 3/4 x 1, Set@250 PSIG, POP-EYE - Hansen 4677817) is a mechanical expanderThe Hansen H5602 250 P is a pressure relief valve designed for NH (ammonia) refrigeration systems, featuring Hansen's POP EYE self alarming technology and Anti Corrosion Technology (ACT). Here's a detailed breakdown: Technical Specifications Model: H5602 250 P Inlet Outlet Size: 3 4" FPT (inlet) x 1" FPT (outlet) Set Pressure: 250 PSIG Pressure Range: 150 to 400 PSIG (10. 4 to 28 bar) Safe Working Pressure: 400 PSIG (28 bar) Weight: ~4 lbs Dimensions: