Alumina Nozzles Size 4 - 0, 25"": High impact resistance, heat resistance and thermal conductivity, and resist splatter buildup, Specifications:, Used on Torch(es): 9, 17, 18, 20, 22, 26, Orifice: 1/4"", Material: Alumina, Type: Nozzle, SKU: ORSNO63050