Terms used in the descriptions of plumbing items and their use.
Bottom Drains help tremendously in keeping a pond clean. They can be connected
to a filter or to a sump where the waste from the bottom of the pond can
be flushed away.
A special plastic fitting to provide a watertight seal through a plastic
container or a flexible pond liner. This fitting also allows full flow
of water and the ability to attach flexible pipe with the use of a male
adapter. The fittings have left handed threads to keep the fitting tight
when installing the male adapter.
Installing Bulkhead Fittings
Remove the sealing gasket and use it as a pattern to cut the hole.
Place the gasket over the area where the bulkhead will be installed and
mark on the inside of the gasket. When cutting the hole in hard plastic
or fiberglass it is best to use a hole saw. Use a breakaway type knife
or other small blade sharp knife to cut a clean hole when installing the
bulkhead in a flexible pond liner.
The bulkhead can be installed with the nut on the inside or the outside
of the liner.
Apply a bead of silicone sealant or lap sealant to the gasket and place
this on the wet side of the installation. The sealant will act as a lubricant
to keep the liner from bunching up and also help to create a watertight
Tighten the nut to the point that the gasket is crushed against the liner.
Install a male adapter to attach your plumbing to the bulkhead. You can
then glue pipe into this adapter to finish the installation.
We recommend the use of flexible PVC pipe to allow some movement to relieve
any stress that could be exerted on the bulkhead fitting.
Couplings are used to attach one piece of pipe to another. These may be
the same or different sizes. Rubber couplings are also used when installing
a pump, UV or other device that you may need to quickly disconnect.
Flexible PVC Pipe
Flexible PVC is a very strong pipe that is easy to work with. It glues
into standard schedule 40 PVC or ABS fittings. It provides more water
flow than you would have from using rigid pipe and elbows.
Hose clamps are used to keep tubing attached firmly to the barbed side
of a male insert.
Used to connect flexible tubing to a pipe or a device. One end is threaded
and the other is barbed to hold the tubing.
Slip - Glues* to fitting or pipe
FPT - Female Pipe Thread
MPT - Male Pipe Thread
Bushing - a part that is glued* or threaded into a fitting such
as a coupling or elbow to adapt to a different pipe size.
*When working with PVC and ABS pipe always use the all purpose glue.
A gate valve is also called a knife valve. They are easier to use than
a ball valve for fully opened or closed operation. Not for regulating
Used to regulate water flow through a pipe. Allows for complete flow when
Valve, Free Flow Check
Use to provide flow in one direction only through a pipe. When installed
before an external filter it keeps the dirty water in the filter from
flowing back into the pond if power is lost. Also to keep an external
pump primed if power is lost.
Spring type check valves should NEVER be used
in a pond installation.