kit

It's the last dive of your trip. The site is one of your favorites and you can't wait to finish off a great vacation with one last dive, then the unthinkable. You hear a pop followed by the hissing of air, you've blown an o-ring. The DM pulls out a tank o-ring only to realize it's the spg spool. "I don't have those o-rings so take this spare reg."  the DM says, offering a piece of gear that has seen better days. You take it and do the dive, breathing wet all the way .