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RD-100-R Watts

Overflow Roof Drain with 2 in. External Water Dam

Series RD-100-R epoxy coated cast iron overflow roof drain with flashing clamp with integral 2 in. (51mm) high external water dam, self-locking polyethylene dome (standard), and no hub (standard) outlet.


  • Self-locking polyethylene dome (standard) and no hub (standard) outlet simplify installation and maintenance
  • Engineered with cast iron for long life and durability
  • Flashing clamp and integral gravel stop and high external water dam ensure reliable drainage

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific RD-100-R