Marathon Roofing Products has made available its Retrofit Ring & Dome, which will match up to most old-style existing drains. The ring is suitable to most standard three- and four-bolt pattern styles. By aligning the ring over the existing bolt holes in the old drain body and installing the new hold-down bolts with washers, the problem of replacing matching domes is resolved. Aligning “Open V” channels of the Retrofit Base Ring to the scallop openings of the Retrofit Dome creates optimum drainage. The low-profile cast-iron dome weighs 21 pounds and is designed for reroofing applications when a clamping ring is important to secure single- and two-ply membranes in waterproof roof systems. The ring and dome may be purchased separately or in combination.