Model 591 Series High Pressure Piston Regulators feature a reliable piston design for precise gas control at high inlet and delivery pressures rating up to 3000 PSIG. Like all GENTEC quality products, the 591 series provides superior performance and safety features. Piston type construction Body and housing cap are machined from class “A” brass bar stock Delrin cap bushing for smooth adjustments Sintered bronze inlet filter 2-1/2" gauges Weight: 4 lbs Conforms to CGA E-4 standard for gas pressure regulators