This item includes: Zeagle Octopus with LP Hose and owners manual; Zeagle Envoy II Octopus; Simple, dependable downstream on-demand Envoy II; Dive/Pre Dive Venturi Control Valve Design; Materials: Cover: Flexible thermoplastics case: Ridged thermoplastics large-diaphragm: Elastomeric Polymer exhaust valve: Elastomer mouthpiece: Silicone Rubber O – rings: Buna – Microphone