Currently, it's checked in the code if the player is wearing a copper backtank item.
This could be switched to checking for an item tag instead, allowing addons to add different kind of tanks.

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.

Created #3319 to solve the same issue on 1.18

Suggestion PR at #1960