The Watts GRD-730 is a green-roof large multi-level planter drain designed for subsurface drainage in vegetated roof systems. Its epoxy-coated cast iron body provides corrosion resistance, and it includes a bottom flashing clamp, a perforated ABS standpipe (extendable or cut to size), stainless-steel screened aluminum dome guard, and a standard no-hub outlet.

Key Features

• Intended for subsurface drainage in green-roof planter systems

• Epoxy-coated cast iron body for long-term durability and resistance to corrosion

• Bottom flashing clamp for secure roof membrane integration

• Perforated ABS standpipe that can be extended or cut to length

• Stainless steel screened aluminum dome guard to prevent debris intrusion