when I connect the hosepipe to the cold water tap in the kitchen, after a short time water pours out of the overflow pipe from the loft/roof.
The same happens if I have the karcher pressure washer connected.
Obviously if i turn the tap off, all returns to normal.
I have heard of the hozelock non-return valve or something, could this be the issue or fix the issue (i dont have one), but now I am guessing.
I do not have another other problems with the water supply in the house.
Any advice would be gratefuly recieved
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