15 in Main and Overflow Combination Roof Drain

SPECIAL ORDER ITEM. Review Returns Policy before purchase. Engineered for commercial roofing applications, this combination drain system features dual cast iron bodies with a protective coating to resist corrosion. The assembly includes integrated membrane flashing clamps and gravel guards to secure roofing materials while preventing debris from entering the drainage system. Equipped with low silhouette domes, the unit maintains a streamlined profile on the roof surface. This system is fully ASME-, UPC-, and IPC- compliant, ensuring it meets rigorous plumbing standards for safety and performance in large-scale building projects. The double top-set deck plate facilitates installation on various roof deck types, providing a stable and secure mounting foundation for the drainage assembly.