The Victor 0781-5143 ESS4 Heavy Capacity EDGE Series Inert Nitrogen/Argon/Helium Regulator has outstanding flow performance that provides better flow control across a full range of cylinder pressures, with exceptional sensitivity and precision in delivery pressure. It is a single-stage design regulator with the following safety and design benefits: High-strength Zinc-Aluminum alloy housing cap Forged brass body Stem-type seat mechanism External self-reseating relief valve Nickel-plated bronze sintered inlet filter More natural, safer hand/body position while adjusting delivery pressure Gauges feature high-contrast graphics for a quick read Color-coded SLAM impact-absorbing safety knobs for at-a-glance gas identification Delivery Range: 5 - 125 PSIG Gauge Range Inlet: 4000 Gauge Range Outlet: 200 CGA Inlet Connection: 580 Outlet Connection: 5/8" - 18 M LH Max Inlet Pressure (PSIG): 300 Flow Coefficient (Cu): 0.283 Smallest, lightest and most compact heavy duty industrial regulator on the market Meets or exceeds CGA E-4, UL 252 and ASTM G-175 Promoted Ignition Test With the Victor Professional EDGE Series Regulators, Victor continues to offer the safest, most reliable and highest quality gas control technology, giving you more value for your purchase. In addition, standardized designs and components throughout the EDGE family greatly simplify regulator service and repair. All Victor EDGE Regulators are easy to use. The EDGE Series regulators have easy-to-read gauges with enhanced graphics, color-coded knobs for quick gas identification and more natural and safer hand/body positioning for adjusting delivery pressure. The advanced design makes them the most compact and durable industrial regulators available on the market.