The original high quality Australian made ventilator manufactured from durable, UV resistant, reinforced nylon material to withstand the harshest of Australian conditions. The special nylon material also allows it to withstand impacts such as standing on the vent, without the ventilator breaking. The "SEABIRD" ventilator gives a large airflow either intake or exhaust - while remaining waterproof due to the unique baffled design. Includes an integral internal hose flange to take 75mm blower hose. Requires a 75mm diameter mounting hole. Suitable for yachts, cruisers, pontoon and dock venting Etc.