This is the Harrison Pro Valve HSV-C-48 Convertible Scuba Tank Valve Features: Exceeds CGA V9 standards for cylinder valves for compressed gases. Cycle tested 5000 times to exceed all real world applications. Engineered with high flow characteristics to maximize regulator performance Valve design allows for easy and comfortable cylinder handling Slant back hand wheel allows easy access Easy operation under all pressures. Protective and attractive chrome plated finish. Positive hand wheel grip for easy identification of on/off direction. 100% leak testing on entire production. Harrison Pro Valve HSV-C-48 Convertible Scuba Tank Valve(HSV-C-48).