4 in Overflow Cast Iron Roof Drain

SPECIAL ORDER ITEM. Review Returns Policy before purchase. Engineered for commercial roofing applications, this overflow roof drain features a robust epoxy coated cast iron body designed to manage excess water accumulation. The unit includes an external water dam that maintains a specific ponding depth to prevent roof structural overload during heavy precipitation. Equipped with a self-locking polyethylene dome, the drain effectively filters debris while allowing water flow. This assembly meets ASME-, UPC-, and IPC- standards for plumbing safety and performance, ensuring reliable drainage operation for flat roof systems requiring overflow protection.