Appliance traps perform a number of functions which range from connecting one sink and one appliance, to multiple sinks and multiple appliances from one trap. The Traps offer dedicated spigots for household appliances like dishwashers and washing machines. Installing these traps correctly prevents backflow, stops bad smells, and ensures discharge water from appliances drains smoothly into the main waste line.
Step 1: Dry-Fit and Verify Layout
Prior to installing your appliance trap it’s important to understand the type and number of sink outlets you will be connecting to and how many appliances will need to be connected to your trap (i.e. dishwasher waste hose, washing machine hose etc.). This information will determine what type of undersink trap you will require.
Before installing your appliance trap we recommend lining your trap up to all sink connections to make sure you have enough adjustability within the trap and to make sure the outlet of your trap can be connected to your waste pipe. It’s at this stage where if required you should shorten any of the adjustable lengths.
Step 2: Mount to Sink Outlets
When connecting your trap to your sink outlets the seals need to be 100% flush with the outlet. Tighten all upper securing nuts firmly by hand until the assembly holds without movement. There should be no lateral movement between these parts once they are installed correctly.
Repeat step 2 for all sink outlets.
Step 3: Connect Main Waste Line
To connect your trap to your waste pipe remove the threaded nut, blue finned rubber seal, and blue spacer from the outlet of your trap. Place the threaded nut over your waste pipe, with the exposed threads facing towards the end of the pipe the trap is connecting to. Then place the spacer on to the waste pipe followed by the finned blue seal. It’s important the smaller end of the seal is facing towards the end of the pipe that is connecting to the trap.
Once the seal is in place, the threaded nut can be threaded onto the trap, which will create a compression seal between your waste pipe and trap. After the threaded nut has been hand tightened a final ¼ turn is required. A final inspection of the connection is required to make sure the connection has been made by pulling on the pipe and fitting. This may not be suitable in certain applications.
If you are connecting your Polypipe trap to a piece of metal waste pipe or a non-kitemarked solvent weld or push fit waste pipe, you can remove our unique patented blue Fit-Rite® insertion aid.
| Tip: When installing non-Polypipe traps that have an insertion aid you will need to cut the insertion aid out of the fitting for it work. |
Step 4: Connect Appliance Drain Hoses
Connecting appliance waste hoses to your undersink traps is done by either removing the cap from the hose or if no cap is present, by cutting the end of the hose off. This process differs depending if the hose is straight or angled.
Once the cap is removed or the hose end has been cut away, you can connect your hose to the hose connection. Place the appliance hose as far over the hose connection as is possible making sure there are no kinks in the hose once it has rested.
For our most up-to-date installation guidance, check out our downloadable installation guides via our Technical Hub.