Geez, I havent delt with a pulse air system in probably 15+ years, but what I do remember is the metal pipes are just mild steel, and the rubber lines are basically heater hose, not silicone or anything fancy. I remember replacing the rubber lines in a pulse air system MANY years ago, and using heater hose, and it worked just fine. There are one way "poppet" valves in the line, and they love to rust out internally due to moisture in the exhaust. Have had to replace more than one of those over the years. I hope this info helps, and I wish I remembered more details, but like I said, it has been YEARS since dealing with one of these systems.