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The D/W uses 6.5L per complete cleaning cycle, with 3 fills per average cycle, at 2.16L per fill. So it doesn't need much flow. It would mean ripping the kitchen units apart to get at the pipework behind the back panels, so this is the lesser of the two evils. The installation is part way through, I'll let you know how things go. Incidentally I've used 4 self cutting 15mm valves for dish washers & washing machines over the last 20 years, never had any problems. This is my first self cutting drain, unfortunately the existing drain fittings are glued not compression.
Stearman65