MIFAB® R1150-M-2.75H combined roof drain and secondary overflow system, consisting of one piece lacquered cast iron drain body with integral sump receiver, cast iron waterproofing membrane clamp rings with integral gravel stops, one 2 1/2” (64) high fixed integral cast iron overflow standpipe and two self-locking aluminum low profile dome strainers with a free area of 20 square inches each and 2 1/2” (64) in height.