15 in Large Capacity Primary Roof Drain

SPECIAL ORDER ITEM. Review Returns Policy before purchase. Engineered for commercial drainage, this primary roof drain features a cast iron body designed for high-volume water management on flat or low-slope roof applications. The assembly includes a combination membrane flashing clamp and gravel guard to maintain a secure, watertight seal at the roof surface. A low silhouette dome manages water flow while blocking debris from entering the drainage system. This unit is ASME- certified and UPC- and IPC- compliant, meeting the rigorous safety and performance standards required for complex building projects and professional plumbing installations.