Product DescriptionWelding Hose Grade T 1/4" x 100'"B" Fittings - Both Endsfor Alternative Fuels and Acetylene Gas & Oxygen Grade "T" twin welding hose is specially designed for alternate fuels such as LP, propane, natural gas & propylene. However, it can also be used with acetylene. It is more expensive than Grade R because it is made to resist the effects of the oils in propane. Although Grade T can be used for "All Fuel Gases", it is recommended to change the hose when switching between acetylene and alternate fuel gases. This is because of the residual oils from the propane lodge themselves into the pores of the hose.