1-1/2" 40 mm Wide Nozzle. Leister heat welder 1-1/2" Wide Plastic Welding Slot Nozzle Push fit with a screw to be able to tighten for a secure fit. Fits on a Leister Triac-S, Triac-ST or Triac-AT Hand Held hot air welder. This is the most popular tip for heat welding roofing seams.