The Watts RD-100 is a large-area roof drain engineered for primary drainage on roofs. It features an epoxy-coated cast iron body, a flashing clamp with an integral gravel stop, a UV-stabilized self-locking polyethylene dome (standard), and a no-hub outlet (standard).
Key Features
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Designed for primary roof drainage with a heavy-duty cast iron body
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Flashing clamp plus integral gravel stop for proper installation and protection
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Self-locking dome designed for debris resistance and long-term durability
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Standard no-hub outlet, with multiple outlet and dome options available
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Accepts a variety of pipe sizes (2″–6″) and offers optional accessories such as sump receivers, ballast guards, or extension flanges
