On the whole we believe it is much better to spend a bit more time getting the waste pipes done properly by installing a standpipe so any waste can be taken via its own trap to the main drainage outside. Measure the height of the appliance from the ground and mark it’s height on the wall. Use a tape measure to measure from the base of the collar of the compression joint up to the line on the wall defining the appliance height.

In some instances, running a new waste pipe from an existing waste isn’t going to be possible or there may be a convenient drain or soil pipe just the other side of the wall that would be much easier to run a waste to rather than removing kitchen units or trying to alter them.In terms of the height, the top of the standpipe should be 100mm under the underside of the worktop. If there is no worktop then the top of the waste pipe should finish at approximately 50mm down from the top of the washing machine or dishwasher. In terms of the waste trap itself the document states that it should be at minimum 40mm in diameter and the depth water in the trap to form an effective seal should be at least 75mm. Place a joiner on the end of the existing pipe and glue it in place. Add any further pipe joints to remake any waste outlets that you cut away e.g. sink waste etc. Finally use a good quality external silicone sealant to fully fill the gaps around the pipe running through the wall to stop any heat loss.

Once all prepared, slip the pipe through the wall and mark the pipe clip fixings and then fix them in place using screws and wall plugs. Once in place, tighten the Jubilee Clip all the way to hold the pipe in place. Once this is done, you’re all finished. Slip the body of the compression waste over the end of the new horizontal run of pipe (or pipe through wall if running externally) until it hits the end of the collar and then slip the seal and washer down to the end and then screw the cap up tight, ensuring the inlet is pointing directly 90° upwards. As we have mentioned, installing a standpipe to use as an appliance waste is the best solution and can be done fairly easily, as long as you have good access. Ideally any washing machine, dishwasher or similar should be installed as close to a foul drainage point as possible, this is normally around the sink area.As there will be water and waste in the trap you are removing, place some old towels or clothes over the area and also a bowl underneath to catch any waste water.