Aluminator Retrofit Roof Drain with MaxxFlo Seal has a 1.25-inch aluminum ring with 12 scallops and seep holes beneath. The design forces drainage and restricts water flow to prevent swirling effects.
Its MaxxFlo mechanical seal exceeds ANSI/SPRI RD1 for water backflow. Installation tool included. Available in 3-, 4-, and 6-inch sizes.