how can i connect 2 waste pipes to one stand pipe?

I'd replace the U bend connector with a T and an elbow and reconnect the U bend connector on the onto the elbow, and put an short length of pipe on the straight part of the T and the new U bend connector there. Does this make sense:

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You'll need: tee, elbow, 3" of pipe, 3" of pipe, 8" of pipe, another U bend and upstand pipe.

On Thu, 10 Jul 2008 04:55:59 -0700 (PDT) someone who may be benpost wrote this:-

I would first test that the existing waste pipe can cope with both appliances pumping out at the same time.

If that is the case I would fit a running trap [1] roughly where the existing trap is. On the end of this I would fit a tee, with the existing standpipe in it. I would continue from the tee with a short length of pipe to an elbow, into which I would put another standpipe.

Roughly (used fixed with font to view):

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thanks for the replies, i found this one on the mcalpine site, would it work ? the only think i can see which might be a problem is the pipe i have does not have a thread to screw this adapter on to

On Thu, 10 Jul 2008 07:23:01 -0700 (PDT) someone who may be benpost wrote this:-

Whether it works depends on whether there is an air inlet in the gadget. The hole in the middle may provide this,though it looks a little small.

I suspect you would find that at the bottom of the photograph is not a threaded connector, but a compression fitting for screwing onto a plain bit of 40mm pipe.

HTH

John

An option that is worth considering is the Marley sink trap with two extra inlets - 1 for a washing m/c the other for a dishwasher.

It works well here & saves a lot of space and avoids messy stand pipes, but the m/cs are only run together overnight (Economy 7). Additional advantage is that all connections are sealed. Initially I was concerned that connecting the 3 wastes through 1 trap might overload the trap (with waste coming up into the sink) but that has never occurred.

Ours came from B&Q but any Marley stockist should have them. Only seen them in the Marley range.

HTH

Our washing machine instruction book says that the waste outlet should be hung over a trapped pipe at between 30 and 36 inches above the base of the washing machine, normally a sink trap is a lot lower than this. Admittedly the WM is quite old (purchased in June 1993, Servis Gem 800) maybe the drain arrangement on newer ones are different? Don

I got the same one as John and am going to fit it later, as he said about 8" above the u bend . thanks for all the help