The Dive Rite Octopus Strap holds a spare second stage against the harness and releases with a firm tug, so the alternate air source deploys without needing to be unclipped by hand in a share-air situation.
The low-profile sliding bolt snap keeps the octopus streamlined against the body rather than hanging loose, and the strap allows the spare second stage to be moved quickly from one D-ring to another as the diver reconfigures.
