connecting kitchen appliances into waste pipe

2 Dec 2004
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United Kingdom
Hi all,

I need to connect a washing machine, dishwasher and kitchen sink into one waste pipe.

The washing machine will be on the far left. Then the sink, then the dishwasher on the right.

Initially I though of having a single trap which is located at the last possible point prior to the waste pipe exiting the house. Each appliance and the sink would then not have individual traps. Is this a good idea?

Secondly I thought of using the appliance connector adaptors with check valves directly into the common waste pipe. The sink would then have a trap as normal directly under the plug hole. The applicance would not therefore have a trap as they would connect into a common waste outlet after the sink trap.

Thirdly I considered using vertical open sections of pipe and having the appliance hoses dangled in. However I was not keen on the fact that the height of water in the sink would be higher than the outlet of the vertical pieces for the appliances. In theory, a full sink when the plug is pulled could be too much for the waste pipe and could back up and overflow from the open ends.

Or is there another way? I want to make the simplest, lowest maintenance connections as this is all going to be quite inaccessible once all the units go in.

Many thanks
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