50 FEET Grade"T" - 1/4" OxyFuel Welding & Cutting Twin Hose with BB Fittings - S&Uuml;A Grade "T" Twin Wedling Hose for iots use with Propane, Alternative Fuel Gases and Acetylene Diameter: 1/4" Fittings: Type: B - B Size: 9/16"-18 LH for Fuel gas & Type: B - B Size: 9/16"-18 RH for Oxygen Grade "T" twin welding hose is specially designed to resist the effects of the oils in propane. It is also more weather-resistant. Grade "T" Twin Fuel Gas Welding Hose is designed for transfer of many commonly used welding fuel gases and oxygen in applications to 200F and 200 psi. ose Length: 50 ft.