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The air vent head is manufactured according to JIS standard of marine. It is small in volume, beautiful in design, reliability in function and anti-flow backward, used on air pipes of desk in oil tank, seawater tank and fresh water tank. Dimensions of flange are according to JIS b***0, other types are available by customers' requirements. These are also approved by ABS,LR,CCS,DNV,KR,etc.Welcome you to contact our * *@********************dy>