Watts - GRD-640 - Green Roof Metered Overflow Drain Tactile Paving Dura-Coated Cast Iron Upper &

Dura-Coated Cast Iron Upper & Lower Bodies: Strong and corrosion-resistant construction that holds up under load and weather exposure

resisting corrosion and weather exposure while maintaining structural strength

This design aligns with research from the University of California Statewide Integrated Pest Management Program

heavy grates

A durable alternative to concrete drains

Watts - GRD-640 - Green Roof Metered Overflow Drain Tactile Paving Dura-Coated Cast Iron Upper &The Watts GRD 640 is a stainless steel metered overflow drain designed for green roof and planter applications where controlled secondary drainage is required. Its epoxy coated cast iron body provides long term durability, while the perforated stainless steel gravel guard with secured solid cover helps prevent debris and ballast intrusion. The ABS standpipe includes a 5 8 inch orifice to regulate overflow, and the drain comes standard with a no hub