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Lol. I said I was no plumber ! so I have reverted back to the original trap as the anti vac made no difference and have raised the dishwasher waste pipe as high as possible. I have also changed the trap so that it is much higher up and closer to the dishwasher spigot. the outside is just a...

Hi all, I wonder if anyone can shed some light on a problem. I have a newly installed kitchen, including a double sink. The dishwasher (which is brand new) is next to the sink and drains into a spigot just above the Ptrap. The ptrap has a vent as well. When the dishwasher drains there is a...