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It's only because I heaved it into the too small gap* that I know how to wrench it out again.
*Measured the gap at the top, giving the original kitchen installers too much credit thinking they would have fitted the units square....
I think the Y fitting has cracked it. Will throw PTFE tape, fernox and maybe a leak alarm at it and then forget about it for 5 years. Thinking about it, it's kind of like a ghetto dishwasher install. Except the dishwasher will water a 16m square lawn and clean a bike every now and then.
You should have seen what I did to our old dishwasher when trying to remove it, ignorant of this rear foot / floor tiles issue. The guys who had to take it away in bits laughed when the saw how I dealt with it.
thousand yard stare
Ours was done on the water supply in the bathroom so that may not help you much.