Under sink spigot or seperate appliance trap for dishwashers etc

[Bob Hill]

Hi all,

I'm interested in what people's usual practice is when installing kitchen sinks and associated pipework for washing machines, dishwashers and other appliances that need a waste. Do you just use those spigot connectors which sit between the sink connection and the trap or do you run a separate P trap and pipe for the appliance.

My experience has been that those spigot connectors often lead to appliances back flowing into sinks or at least causing noise down the plug hole - but this may just be that the rest of the run is badly installed. Seems to me that a tee'd off separate pipe with trap will allow better drainage especially if both sink and appliance are in use at once.

Thoughts?

 

[SimonG]

Never had a problem with a spigot as long as the appliance waste pipe is installed correctly.

 

[kirkgas]

I fit whatever is easiest, I've fitted 100's of McAlpine double spigot traps never had a prob, if there's a machine either side of the sink they are perfect, but if a run is required I fit a pipe run and separate trap

 

[Mike Jackson]

I like the spigot ones as if there's a blockage it backs up into the sink and gives a warning rather than flooding over the floor behind the machine.

 

[Howsie]

As Simon points out, the run of the waste pipe makes the difference.

 

[SimonG]

Seen a few installed that fill the washing machine with mucky water. Does not smell nice.

 

[Destroyer2813]

People that don"t angle the spighots up that cause the problems

 

[kirkgas]

Seen a few installed that fill the washing machine with mucky water. Does not smell nice.

If the waste hose is taken through the unit as high as possible then back down into the spigot rather than straight through at the spigot height this won't happen, again it's all about good working practices

 

[Ch4 plumbing]

Use a spigot trap if it's under a sink but if theirs no sink/trap then ill use a standpipe, and of course use the u clip and screw it to the wall.