Watts - GRD-640 - Green Roof Metered Overflow Drain Tactile Paving This design aligns with research

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

A durable alternative to concrete drains

Z415SC-2IG

Non-Tilt Grate: Designed to handle vehicular loads while resisting displacement and maintaining high flow capacity

Watts - GRD-640 - Green Roof Metered Overflow Drain Tactile Paving This design aligns with researchThe 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