The KA950-O2 is an excellent compromise for the angler that is looking for a full size, inexpensive, medium priced, reliable regulator. The unique angle of the KA950-O2 allows it to install parallel to the oxygen cylinder, and provides compact storage. 12 Settings: OFF, 1/32, 1/16, 1/4, ½, ¾, 1, 1½, 2, 3, and 4 liters per minute. These settings will provides sufficient pressure and oxygen for premium quality diffusers as our KA970-O2, and KA975 diffuser, as well as inexpensive air stones. Silver anodized aluminum body with brass components. Designed for use in a marine environment. EXTRA protection to prevent moisture and dust contamination. The 5/8" diameter dust cover next to the hose barb keeps contamination from entering the safety orifice required for all regulators. It provides additional protection if left on.