Victor 0781-1470 SR4K-680 Professional High Pressure SR 4 Regulator has been designed for heavy duty applications and for larger cylinders. Ideally suited for pressure vessel testing and dead-end testing. The design and construction features a machined brass body and housing cap, 2.5 inch brass gauges, a cartridge type seat assembly with PCTFE seat, a brass piston type actuation, a Delrin cap bushing for smooth adjustments, and a bronze sintered inlet filter. Delivery range in PSIG is 300-4500. Gauge range inlet is 6000 and the outlet is 6000. CGA inlet connection is 680 and the outlet connection is 1/4 inch swaglok. Maximum inlet pressure in PSIG is 5500 and the flow coefficient in Cv is 0.1147.