Roof Drains: RD-One Piece Combo Overflow RD-250 cast iron combination roof drain/overflow with deck flange, drain body, flashing clamp with integral gravel guard, overflow standpipe with membrane clamp, self locking cast iron dome, and no hub outlets. Available in 2", 3" and 4". Listing Back To Top Design Visualizer Previous Next Design Visualizer CADdetails™ You need to be logged in to view & download files. Login/Register New to CADdetails? Register to enjoy full access to unlimited 3D models, CAD drawings and specifications. It's free! Downloads Architectural Product Information About Specs Media CAD Toolbar CADdetails™ Download All Manage & Share Website Share Add to Project Favorite User Feedback