UNI5 Propane Tip Tube / Bent Neck 707107 700mm. Tip tubes / bent necks are widely used in welding, cutting and heating. Cuts up to 150mm with Acetylene, 75mm with Propane, welds mild steel up to 25mm / 1". Heats between 72000 to 618000 BTU/H with Propane. Click Here to see associated products.