Patent ID: 8511148

Claim:
A vessel comprising: a cylindrical section coaxially disposed about a central axis of the vessel, the cylindrical section comprising an inside vessel surface, an outside vessel surface, an upper end region terminating at a rim circumscribing a vessel opening, a vessel groove formed at the outside vessel surface in the upper end region, and a lower end region axially spaced from the upper end region; a bottom section disposed at the lower end region; and a flange configured for supporting the vessel at a vessel mounting site, the flange comprising: a lower ring comprising an annular lateral portion and an annular flange portion, the lateral portion disposed in the vessel groove and comprising an outside lateral surface concentric with the inside vessel surface, the flange portion comprising an upper flange surface and a lower flange surface perpendicular to the inside vessel surface, wherein the flange portion has an outer flange diameter greater than the outer vessel diameter, and the lower ring terminates at a pair of opposing lateral end surfaces separated by a gap; and an upper ring comprising an inner section extending over at least a portion of the rim, and an outer section securely engaged with the upper flange surface.