There is a gasket between the pump and the engine, however I have never seen one leak oil. I think it is just a thin paper gasket.Performance Products has an exploaded view on their site.

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82 300d 194
75 240d sold
Gulfstar 41 4-107 Perkins Westerbeke 4.4 Gen
Puegot Bicycle Legs
AYP Lawn Tractor Briggs 12.5