The Watts RD-300-R is a medium-area overflow roof drain designed to provide secondary (emergency) drainage when primary roof drains are overwhelmed or blocked. Its epoxy-coated cast iron body offers long-term corrosion resistance, while the flashing clamp and integral gravel stop ensure a secure, watertight membrane connection. A raised external water dam sets the overflow height, and the self-locking polyethylene dome helps keep debris out. The unit is supplied with a standard no-hub outlet for straightforward installation.
Key Features
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Raised external water dam for controlled overflow drainage
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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 attachment
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Self-locking polyethylene dome for debris protection
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Standard no-hub outlet for easy connection
