The RAC Deluxe RetroDrain is constructed of aluminum & stainless steel for durability and designed for use with single ply, BUR and modified bitumen roofing systems. The drain features an extra large flange for positive attachment of the roof flashing membrane, a recessed metal clamping ring for roof termination and proper drainage, along with an oversized drain strainer to minimize damming. The patented RAC Backflow Compression Seal is compatible with PVC or cast iron leader pipes.