The new Watts Big Daddy RD-800 Series dual-roof drains provides drain overflow protection. The exclusive dual roof drain/overflow combinations offer outstanding leakage protection, durable construction and ease of installation, Watts notes. Big Daddy eliminates the need to cut separate holes in the roof for overflow drainage. In independent lab tests, the 10” outlet model achieved a 1,368-gpm flow rate, demonstrating flow rates much higher than multiple single-roof drain and overflow units can deliver, the company adds.