Bottom Drain
Installation Instructions
1
Find the lowest point in your pond if possible. Dig the bottom of your pond at an
approximate 30° downward slope to create a small area where water flow can be
collected.
2
Install all necessary drainage pipes including a 3" elbow (90°) directly underneath the
lowest point in your pond. This is where the bottom drain will be installed.
3
Install the lower half of the bottom drain at the predetermined point in your pond,
attaching it to the PVC elbow pipe with PVC glue.It is important that this connection is
totally secure. When this step is complete, the installed piece should be recessed at least
3
/
4
" below the level of the pond bottom.
4
Install your 45 mil EPDM liner. After your liner is fully installed, locate the spot where
the lower half of the bottom drain has been installed underneath the liner, using your fingers find the six screw
holes located in the gasket and rim of the bottom drain lower half. With a white pencil mark your liner with the
location of the screw holes. Using an awl or punching tool, punch through the liner at the pencil markings being
careful that the diameter of the punched hole is not wider than the diameter of the screw hole in the rim of the drain
underneath the liner.
5
Apply a light coating of silicone sealant to
the liner in the circular area directly covering
the screw holes. Then align the screw holes in
the upper half of the bottom drain with the holes
punched in your liner, using the six flat head
machine screws provided attach the upper half
to the lower half. It is important that the studs on
the rim of the upper half of the drain should point
upward, the flat surface of the rim should be flush
with the liner. Do not over tighten! At this point
the liner should be firmly sandwiched between
the halves of the bottom drain, and the rim of the
upper half should be level or slightly below the
bottom of the pond. This will create a final drop
into the drain.
BDA Air Connection
or BD1 Plug
Bolts
Top Flange
Bottom Flange
of Drain
3" Elbow
(not included)
3" Pipe
(not included)
Pond Liner
Liner Underlayment
(do not cover over flange)
Rubber
Gaskets
BDA
BD1
