53ON Air Vent Heads for Oil Tanks & Marine Service — IMPA 872301-872307

53ON air vent heads are fitted to oil tank vent lines and other marine service tanks on cargo ships, container vessels, tankers, and offshore support vessels. They maintain controlled tank pressure during loading, discharge, and temperature changes while keeping seawater, rain, and debris out of the vent system. The float-operated design closes automatically if liquid rises into the head, protecting the tank contents and the surrounding deck area from overflow. This catalogue page covers the complete seven-item series, IMPA 872301 through 872307, with every code available and priced individually so purchasing officers and chief engineers can order exactly the sizes their tank schedule calls for.

Each unit is built to JIS F7400 with a JIS B2220-5K flange pattern. The body is FC200 cast iron, the top cover and screen cover are SS400, and the internal filter is STS304 stainless steel. The stainless float is STS316 for corrosion resistance in salt-laden air, while NBR rubber rings and cushions seal the working parts and the asbestos cushion seats the top cover. Fasteners are STS304 hex bolts. This combination of cast iron structure, stainless wetted parts, and rubber sealing gives dependable service in the humid, salt-laden conditions found on deck and in pump rooms, with straightforward access for inspection and cleaning.

ALL-K MARINE Ship Store trades internationally as ALL-K MARINE CO.,LTD, a China-based wholesale and retail supplier of IMPA-coded marine stores and ship supplies. The full IMPA 87 machinery range is available from stock alongside this 53ON air vent head series, with supplier QC inspection before dispatch and competitive wholesale and retail pricing. Send us your IMPA list for a 24-hour quote. We ship worldwide through freight forwarders, and on request we can deliver to your local ship agent for onward transfer to the vessel.