Watts RD-100-SO Side Outlet Roof Drain Specs

Dimensional data is subject to manufacturing tolerances and change without notice. 


Specifications: The Watts Drainage RD-100-SO is an epoxy-coated, cast-iron side outlet roof drain with flashing clamp. It includes an integral gravel stop; self-locking polyethylene dome; and no hub (standard) outlet.    


Pipe Size (in.) A B C
2" (-2) 4-5/8 in. 8-7/8 in. 15-15/16 in.
3" (-3) 4-3/32 in. 7-3/8 in. 14-7/16 in.
4" (-4) 3-5/8 in. 5-5/8 in. 12-11/16 in.

Outlet Types

No-Hub Outlet (-NH)
Push On (-P)
Threaded Outlet (-T)
Inside Caulk (-X)




Galvanized Body and Flashing Clamp (-13) Ductile Iron Low Dome (4-in.) (-K40)
Accutrol Flow Restrictor (-A) Aluminum Dome (-K80)
Sump Receiver (-B) Rough Bronze Dome (-K81)
Underdeck Clamp (-D) SS Mesh Covered Dome (-K83)
Stainless Steel Ballast Guard (-GSS) Vandal Proof Dome (-L)
Ductile Iron Dome (-K) 2-in. External Water Dam (-R)
Galvanized Dome (-K13) Adjustable Internal Water Dam (-W)