ABV for 42mm pipes

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Isn’t that the same?
Doesn’t matter which pipe it goes up to cause the tank to overflow.
Hydraulic problem.
No, it isn't. With pumping over, water leaves the F/E tank via the fill (outlet) pipe and goes back in via the open vent. There's no net input of water so no overflow. I tried to query it in #13.
I agree there's a hydraulic problem (likely a blockage somewhere) that needs sorting.
 

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