Watts RD-300 Instructions D'installation page 9

Adjust the roof drain to the height needed with the threaded rods included in the
hardware kit. Tighten the drain at desired height.
The ductile iron dome is impact resistant and finished with standard grey epoxy
coating.
Place the ductile iron dome over the drain body and align the holes for the screws
on both the flashing clamp and the dome.
Place the screws into the holes and tighten until snug.
Drains ordered with the -B Sump Receiver allow lower body flange to set flush
against the roof. The sump receiver is installed into the lower part of the roof with a
thin metal flange that screws into the top of the roof. The metal flange is tapered to a
hole in the center that allows the lower body of the drain to fully recess into the roof.
The lower body flange is equipped with screw holes that allow the drain to sit flush
against the roof when tightened.
The -D Underdeck Clamp option creates an extension that lowers into the roof
with clamps that hold the drains lower body.
The -GSS Stainless Steel Ballast Guard is a 2"stainless steel band that sits on
top of the lower body flange. It has holes that allow the water to flow into the lower
body while holding debris out.
The -R 2" External Water Dam option is a 2" stainless steel band with holes that
sits on the top of the dome flange. It also holds debris out while allowing the water
to flow through the holes.
-GSS Stainless Steel Ballast Guard and the -R 2" External Water Dam parts
are the same, but install differently.
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