Service kit for the Andersen Mini Internal Flange Bailer.

This kit contains the following.

• 1 x Internal rubber gasket

A service document for the Internal Bailer can be found HERE

Internal v external flange...

Its about how they fit in the boat. When you look at the bailer the flange around the bailer has the bolt holes in.

If the flange is flush with the underneath side of the bailer then this is for external fitting. - Such as found on a wooden boat like the Mirror, older GP14, Enterprises etc The bailer is installed from the outside. As well as the slot or the bailer you have to cut away the external surface of the hull so that the flange is flush with the hull. 

If on the other hand the bailer structure projects below the flange this is internal fitting - like on the modern Solo and Europe hulls. The bailer is installed from the inside and the flange bolts against the inner skin. This means you have to juggle a bit to get the outside surface flush with the hull skin. Usually its just a question of adding a gasket or two.