Single stage regulators are designed for performance and reliability in medium to heavy-duty gas welding, cutting and heating applications. Large 2-3/4 in diaphragm and Victor style seat mechanism make this series of regulator true work horses. Self re-seating external pressure relief valve on oxygen model. Features include large 2 in gauges for easier reading, a brass adjusting screw with forged "T" handle, and precision machined nozzles for optimum flow control. The regulators also feature a sintered bronze inlet filter that keeps out dirt and foreign particles. The bodies are made from extra strength die-forged brass.