MIFAB® Series R1270-RG combined large sump roof drain and secondary overflow system; consisting of 24” x 46” galvanized steel sump receiver, two lacquered cast iron bodies with 15” diameter anchor flange, one cast iron waterproofing membrane clamp ring with integral gravel stop and a second 2” high, cast iron external combined water dam and waterproofing membrane clamp ring. Complete with two 12.25″ diameter cast iron RoofGuard dome strainers with horizontal and perimeter drainage slots to prevent clogging of the roof domes.