The National Model 4B Torch is an industrial model torch. The 4B comes with a 1/4″ NPT X 7″ elbow and 9/16-18, “B” size, threaded hose connections (1/4″ hose barb X 9/16-18 adapters come standard).
For propane/ natural gas & air combinations N-4, N-6A, and the P Series tips
National Torch is a specialty manufacturer of heating, brazing, and welding torches. Our products are made right here in the United States, where we have control over every stage of the manufacturing process.