Torch Model, B-Size (9/16"-18). Mounts easily on torch, is readily seen and can be removed for periodic testing. Flows cut up to 12" steel plate or handle heating tips (1200 SCFH at 50 PSIG). Stops reverse flow at point of origin.Fuel Gas LH, B-Size Male to B-Size Female Nut, to 50 PSIG (345 kPa).