The Watts Roof Drain RD-250 is a one-piece combination roof rain and secondary overflow. It includes:

• Cast iron drain body.
• Deck flange.
• Flashing clamps with integral gravel guard.
• Overflow standpipe.
• Self locking cast iron dome.
• No-hub outlets. 
• Pipe Sizes: 2-4 inches
• Optional: Vandal Proof Dome

Product Resources:

• Engineering Specifications