... produce the size of marine ball valve Cast Iron Marine Ball Valves DN40Standard: JIS DIN ANSI or ... air vent heads and piping accessories. Our valves are in accordance with JIS GB, CB, CBM, and ... standard of marine. It is small in volume, beautiful in design, reliability in function and anti-flow backward, ... air vent heads and piping accessories. Our valves are in accordance with JIS GB, CB, CBM, and ...