Watco 591-pp–cp 591 innovator push pull, 17g tubular brass , chrome plated features: eliminates all screws eliminates leaks due to loose overflow attachment eliminates dual inventory of one- and two-hole overflowplates metal strainer body for cast iron or plastic tubs designed for heavy-duty use in hotels, motels, andrental properties approvals: manufactured in compliance with asme a112.18.2-2005/csa b125.2-2005. Patents (innovator ): u.s. Pat. Numbers 5,890,241; 6,637,050; 6,675,406;7,127,752; and patents pending canadian patent number 2,437,448 mexican patent numbers pa/a/2003007344;pa/a/2005002784