![Allen A.338 Rubber 'O' Ring for A.337 Hatch - 4"](http://europe.roostersailing.com/cdn/shop/files/106914_528x528.jpg?v=1725666068)
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Description
Change these regularly if you want to keep a good seal on your Allen Hatch. The O ring is installed around the outside of the gasket (body) which is fixed to the hull, the lid is then screwed tight and forms a seal around the outside.
Please see the Allen Engineering drawing HERE for more details of the rubber seal.