Valve stem with a sealing fluoroplastic bush for the preheating oxygen (KP) valve unit. To be used for gas cutting torches and gas welding torches: R3 “DONMET” 341, RPM “DONMET” 502/503/507/356, G2 “ZIRKA” 224. Valve stem for the gas fuel (GG) valve unit . To be used in gas cutting torches, machine cutting torches and gas welding torches: R1 “DONMET” 142/143/149, R3 “DONMET” 300/300U/337, RМ2 “DONMET” 154, RМ3 “DONMET” 152, G2 “DONMET” 225, “ZIRKA” 224, G3 “DONMET” 251, G3U “DONMET” 247/249, GV “DONMET” 231/231U/250/250U/252/254