replacing burst disc

[Paris]

I believe one of the discs on my air bottle has gone.

Is it simple to replace, just screw off screw on etc...

 

[Evil Rich]

Yes, burst discs are 'unified' not like the old school separate discs and 'plug'
Simply uncrew and replace with correct disc, eg in a 4.5k HPA tank 1.8k for the output and 7.5k main tank disc.