Patent ID: 8701916

Claim:
A plastic oil pan and plastic oil pan drain plug assembly, comprising: a pan comprising upstanding walls, a bottom wall, an exterior surface and an interior surface, one of said walls comprising an opening extending from said exterior surface of said pan to said interior surface of said pan, said opening defined on said exterior surface of said pan by a generally circular raised collar, said raised collar comprising cutouts opposite each other and stop tabs located between said cutouts, said opening defined on said interior surface of said pan by a generally circular raised non-threaded tubular wall, a portion of said non-threaded tubular wall comprising nibs protruding into the opening; a plastic drain plug comprising a head portion, a body portion, an end portion and an o-ring, said head portion comprising an upper first portion and a lower second portion, said upper first portion comprising an upstanding crown wherein said crown is partially defined by downwardly extending tabs located opposite each other, wherein said lower second portion of said head portion is smaller in diameter than said upper first portion, said body portion comprising a circular groove, said o-ring positioned within said circular groove, and a spiral groove located below said circular groove, said spiral groove comprising a upper groove boundary wall and a lower groove boundary wall, wherein said end portion of said plug comprises a tapered outer surface, and said end portion is located directly below an end of said upper groove boundary wall, said upper groove boundary wall is tapered into said tapered outer surface of said end portion, said lower groove boundary wall terminating above said end portion and is tapered into said end portion.