Promate Explorer series features / OC300:
*External air intake resistance adjustment system.
*Internal air deflector for smooth and easy breathing.
*Lightweight and compact, weights merely 7 oz without the hose.
*Prevents jaw fatigue during long dives.
*Large diameter exhaust valve allows for proper removal of exhaled air.
*Recommended 1st stage: DF800NTX, DF300, DF300E, RG100, RG050