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Watts B15-FLG Cast Iron Drain Ring

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Product Overview
Watts B15-FLG Cast Iron Drain Ring for RD100 & RD300 Drains 15-1/2" O.D. , 13-7/8" Bolt-to-Bolt [4 Bolt]

Replacement cast iron drain ring for the Watts RD-100 and RD-300 Roof Drain. 

For instructions on how to measure for a replacement drain ring, visit our resource page, How to Measure a Roof Drain Ring.

This ring is 4 bolt and has closed bolt holes located outside of the gravel stop.


  • Outside diameter: 15-1/2"-in. [13"-in. outside gravel stop]
  • Bolt-to-Bolt diameter: 13-7/8"-in. at 180 Degrees.
  • Casting#: B15-FLG

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