Forney oxy-acetylene twin welding hose for cutting torches. 3/16 in ID and 25 ft long. This is the typical size length for a shop torch. The twin welding hose has B size, 9/16-18 thread brass fittings.
3/16 in ID twin welding hose is often used for smaller torch set ups like port-a-torch outfits. You get less flow with 3/16 in vs 1/4 in but the smaller diameter increases pressure which is good when using smaller equipment. There is also less waste when purging your hoses.
