These high speed electrically heated welder accessories are the interchangeable welding tips and heat elements to match heat requirements. They have a stainless steel barrel and molded glass-filled nylon handle. The high quality plastic welding accessories permit you to do your own fabrication and make your own alterations and repairs to tanks, trays, piping, ducts, vents, and linings. Use a 550 watt to weld polyproplyene and CPVC. Approx. 3-4 lbs air or gas pressure is needed as well as an in-line filter to filter out moisture. Do not weld thinner than 1/16in.