McMaster 4599K44 Gradual On Off Valve, Bronze Body & Gate, Easy Maintenance, Wheel Handle Rising Stem, 3 4 NPT Female, Class 150, MSS SP 80 G2517837 they have a double hinge they have a double hinge Includes Mesh Back No Valve Function On Off Valve Type Gate Actuation Manual Handle Style Wheel Handle Material Iron Pipe Size 3 4 Gender Female Thread Type NPT Flow Coefficient (Cv) 32 Pressure Class 150 Maximum Pressure 300 psi @ 100° F Maximum Steam Pressure 150 psi @ 365° F Temperature Range 20° to 400° F Body Material Bronze Gate Material Bronze Packing Material Graphite End to End Length 2 1 4" Overall Height 7 5 8" Stem Type Rising Seal Type Packing For Use With Water Maintain and repair these valves while they're still inline — you can disassemble the stem so there's no need to unthread the pipe connections