152Q-125 Single Stage Regulators are designed for medium duty gas welding, cutting and heating applications. These regulators are ideal for industrial applications, farm repairs and laboratory testing, etc. Forged brass body and housing cap. Delrin-cap bushing for smooth adjustments. Self re-seating external pressure relief valve on oxygen, inert gas, and air models. Sintered bronze inlet filter. Stem-type seat assembly for more reliable performance. 2" gauges for easy reading. 2" diaphragm. Steel gauge protectors are color coded: green for Oxygen (GP21X) and red for Acetylene (GP21Y). UL Listed.