210Y1-15-B single stage light duty regulators feature a compact rear entry design to meet the demands of special installation, these regulators are best for light to medium duty gas welding, cutting and heating applications, such as industrial maintenance, farm and shop repair, hobby, crafts and home care. Body is machined from class "A" brass. Chrome-plated housing cap, Internal pressure relief valve. Sintered bronze inlet filter. Stem-type seat assembly for more reliable seating. Plastic adjustment knob for smooth "easy touch" pressure setting. 2" gauges for easy reading. 210 series has two gauges and 210Y1 series has one gauge (inlet gauge) only. 1-1/4" diaphragm. Rubber gauge protectors are color coded: green for Oxygen (GP20X) and red for Acetylene (GP20Y). UL Listed.