Decided to open up our auto jackets and check the cans for this season. They're a good 6 years old and only one can replaced when it fell in drink and inflated.
Told to inflate them manually to test the jacket.- all fine
Told that if the can is in ok nick you can weigh them evidently to check full.- ours was corroded.
Also check your trigger if an automatic.- oops, our trigger expired 01/08
Trigger/can pack was under £20, well worth replacing!!!