Abstract: The specification discloses a plural purpose seat attachment for a bucket, and a combination bucket with the seat attachment. The attachment has a cap composed of a polymeric rim and a polymeric plug interfitted with the rim. The rim has an underside annular recess to receive the bucket rim, and a central opening defined by an interior wall. The plug has an exterior wall of a size and shape complementary with the rim interior wall. An O-ring seal and retainer is retained in an annular recess in the plug exterior wall, and compressibly interfits with the rim interior wall to seal the opening and to frictionally retain the plug in the rim until the plug is intentionally removed. The bucket bail interfits with notches in the rim to secure the assembly.