12 in Combination Roof and Overflow Drain with Deck Plate

SPECIAL ORDER ITEM. Review Returns Policy before purchase. This combination roof drain assembly manages both primary and overflow drainage requirements within a single unit to prevent water accumulation on flat roof surfaces. Constructed with a cast iron body, the system includes low silhouette domes and a double top-set deck plate to facilitate installation across various roofing materials. The integrated membrane flashing clamp and gravel guards prevent debris from entering drainage lines, supporting consistent water removal during heavy rainfall. This assembly is ASME- certified and compliant with UPC- and IPC- standards, ensuring it meets rigorous plumbing safety and performance requirements for commercial and residential roofing applications.