This is the Apeks XL4 Octopus Scuba Diving Safe Second Stage Features: This octopus is based on the XL4 second stage Designed for coldwater with the performance you expect from an Apeks pneumatically balanced valve Diver adjustable venturi control Durable and flexible rubber exhaust tee For Yellow Color Regulaor - The unit has a high visibility yellow accent pieces and a 36 braided yellow hose "