This strong tether with a built-in bungee is used with the quick-release
harnesses on rescue PFDs.  The tether enhances towing performance in
rescue situations. The stainless O-ring includes a hook patch of "hook
and loop" material that facilitates centering of the O-ring on vests
that have the loop material sewn on in the back. It also has a hook
patch on the carabiner end. This mates with a loop piece available on
some rescue PFDs, forming a quick-release holder for the carabiner.