Mine is also used with up to 100% O2 as a decompression regulator/cylinder on some dives. As a result its used a lot so yearly.
If using it as a redundant air source its a good idea to breathe from it a bit EVERY dive and give it a good workout every few dives to check its all OK anyway.
If using it as a redundant air source its a good idea to breathe from it a bit EVERY dive and give it a good workout every few dives to check its all OK anyway.