The orifice in the cutting nozzle through which oxygen is directed at the plate for cutting. It controls the amount of oxygen consumed during cutting.
Oxygen Connecting Tubing, Curaplex, 7ft, 6 Channel Inner Lumen Bore, with Universal Connector | Tri-anim Health Services
VL/LM ? Full bore quick valve for gas and oxygen ? A.L.B.A.
Small Bore Oxygen Tubing Water & Humidity Trap I Oxygen Therapy Supplies