Drain structure

In a drain assembly for a drain floor having an opening toward which a drain pipe projects, the combination comprising:

• (a) a tubular plastic body sized to exteriorly fit the drain floor opening, the body having an external thread, and a nut threadably engaging the body thread and rotatable relative to the body, the nut defining an exterior flange, the body and nut consisting of molded plastic material, the body and nut having a common axis,
• (b) a plate defining an upper flange overlapping the top of the body, and a grille bounded by the upper flange and overlapping the upper interior of the body,
• (c) and a tubular base having a flange attached to the nut flange at the underside thereof, the base having a tubular portion projecting downwardly for reception of the upper extent of said pipe, said base consisting of molded plastic material,
• (d) said nut including circularly spaced downward projections extending into the upper interior of the base, the nut defining at least one weep hole extending through the side of the nut at approximately the level of the nut flange to directly communicate with the space between the projections, said projections acting as stiffeners and centering guides, said projections projecting closer to said axis than said thread.