Specification - R1200-PR15 - Large Capacity Promenade Deck Drain with 15" Square Top MIFAB series R1200-PR15" lacquered cast iron deep sump roof drain with 15" diameter anchor flange, large cast iron waterproofing membrane clamp ring with integral gravel stop, square adjustable collar with standard 15" (381) square hinged ductile iron grate with 3/8" (9) maximum width drainage slots and a free area of 80 square inches.