The alternate air source, a.k.a. "Octo" serves as a backup second stage regulator unit. Typically brightly colored and easily accessible your octo serves as an integral portion of the dive system. With models ranging from standard regulators, to new power inflator/air source combos that now eliminate an entire hose from your system configuration. Take a minute and browse our extensive selection of top manufacturer's equipment and also consider some key accessories to get the most out of your new regulator!