The Watts RD-500 is a large-area roof drain engineered for commercial and industrial roof systems requiring high-volume primary drainage. Its epoxy-coated cast iron body provides strong corrosion resistance, while the flashing clamp and integral gravel stop ensure a secure, watertight membrane attachment. A self-locking polyethylene dome helps protect the drain from debris intrusion, and the unit includes a standard no-hub outlet for straightforward installation.
Key Features
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Epoxy-coated cast iron body for durability and corrosion resistance
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Flashing clamp with integral gravel stop for secure membrane integration
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Self-locking polyethylene dome for debris protection
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Standard no-hub outlet for easy connection
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Ideal for large-area primary roof drainage applications
