This is the Genesis Prana Scuba Diving Regulator 1st and 2nd Stage Features: Single Valve Tube Construction provides a precise channel for the poppet to travel Injection molded thermoplastic rubber seat is harder than silicone seats and maintains its shape and does not coin as deeply Diver operated flow control switch This top performing regulator is design to perform in a wide variety of extreme conditions. The dry environmentally sealed flow by piston 1st stage with the patented Dry Air Demand (DAD) will perform for every diver in every condition. The balance 2nd stage will deliver a smooth breathing experience regardless of Depth or Tank Pressure.