Sherwood Global Brass Valve Cga 346 3775 Psi Pressure Relief Device 3/4 Ngt Tapered Thread For Cylinder Tank (Gv34661-35) CGA 346; 3/4 NGT; CG1 PRD; Material: Brass; GV O-Ring Style Cylinder Valves Tapered Thread with 3775 PSI Pressure Relief Device Weight: 2 LB; (We also carry all sherwood valves and cylinder accessories)