Imported post
They DO fail on a 300 bar cylinder. I blew 3!!! Apeks replaced them each time and insisted that they should withstand 300 bar pressure but they don't. However cautiously I opened the valve, they always blew, not always the first time but always within the first 4 or 5 times. You can get a neat spg (Beaver) on a 6" hose from Divers warehouse for not much more than a button spg costs, by the way.