The Watts GRD-630 is a green-roof planter drain designed to provide reliable primary drainage in large planter and vegetated roof systems. Its epoxy-coated cast iron body offers long-term corrosion resistance, while the perforated stainless steel ballast guard protects the drain from soil, debris, and excess loading. A removable cover provides surface-level access for maintenance, and the unit is available with a standard no-hub outlet for straightforward installation.
Key Features
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Designed for primary drainage in green-roof planter systems
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Epoxy-coated cast iron body for durability and corrosion resistance
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Perforated stainless steel ballast guard to protect against debris
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Removable cover allows easy surface maintenance access
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Supplied with a standard no-hub outlet
