jubilee valve burst disk?

[Beginner]

have a carbon fibre tank, with jubilee valve

hooked it up to hose and cylinder, but it leaks air out a small port on the main body of the jubilee valve

does that mean a bust disk? and where do we pick up replacements on Canada or North America 

the styer fill adapter (non quick fill) has no blockage

thoughts

 

[mdouglass]

There's a bolt the back of my vale that has a small hole through the head on two of the opposing faces of the hex head. The disc would be behind that bolt. I'm not sure about replacemnt however. The place where you get the bottle filled should be able to help with a disc.