Cowl ventilator suitable for surface mounting on deck or vertical surface mounting on the stern. Polished 316 stainless steel top with plastic base. This vent is specifically designed as an exhaust vent for use with bilge blowers. It is supplied with a plastic flange to take 75mm (3") diameter bilge blower hose. Size: 124 L x 147 W x 50mm H. 6 x 4mm screw holes.