TENOB large nylon self bailers feature a nitrile one-way diaphragm which is unaffected by petrol, diesel or oil. It also includes a bung sealing plug. The self bailer is available in 2 versions. External mount - mounts externally outside the boat as with normal drain plugs for standard self-bailing. Internal mount - mounts internally on the boat : ideal for cockpit draining and for dinghies and infl atables as plug is readily accessible. Flow rate - 500 litres per hour. Colour - black. 35mm I.D drain hole. Drill a 41mm mounting hole.