i bought some taps recently from one of them Hydrolic airhose fitting and agricultural places, big company name, just cant think of it off the top of me head, but the fittings are like gas fitting but metal , aslo try the plastic ones for model aircrafts/ lawn mower machines with the red tap, about $2.50 and i have had the same one on for 2 years ( bought 3 at the time incase they melted- so far havent needed to)