Specification - R1200-EU - Large Sump Roof Drain with Adjustable Extension for 1-3/4" to 7" Insulation MIFAB series R1200-EU lacquered cast iron deep sump roof drain with 15in diameter anchor flange, large cast iron waterproofing membrane clamp ring with integral gravel stop, adjustable cast iron extension flange, underdeck clamp and standard self-locking polyethylene dome strainer with a free area of 125 square inches.