Plumbing your Project car with A/N Fittings can be a daunting task. Especially when It's a Drag car and you want every fitting to be Serviceable yet leak free. We've used -3 PTFE Teflon lines for Boost Control, -10 200 series PTFE for our mechanical fuel system and -12 & - 16 120 series nylon Braid for the cooling System.