Monobloc Tap leaks from underside only when on. (Pics)

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This cartridge monobloc tap leaks only when switched on from the underside.

Its a drip that seems to come from around the edge of the inner copper near the cold inlet.

I'm scratching my head ... somehow water is finding its way around
from the cartridge chamber on the top to the underside?

Any help would be much appreciated!

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How old is the tap? Either fairly new or someone suffers with OCD.

View media item 62836
It is unlikely that your monobloc tap would leak from the yellow-shaded areas as these will be under constant pressure, and you say it only leaks when turned on.

My theory; pinhole somewhere in the brass block.
 
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Thanks Charnwood

.... the tap is about 3yrs old.

Its not leaking from around those yellow shaded areas where the tails attach.

Yeah maybe a pinhole in the brass block .... does that happen?

Is the brass block screwed into the tap body ... could it need a tighten if thats possible?
 
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Pinholes happen in copper tube, brass tap bodies, monobloc taps, stop cocks, gate valves et al.

Is the brass block screwed into the tap body ... could it need a tighten if thats possible?
Unlikely.
New tap time.
 
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... No not toolstation ... from a bathroom wharehouse place in Abingdon... it was supposed to have been Italian quality made!

.... time for a new tap then :(
 
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Problem solved ....

To my surprise I found I could knock out the brass insert, I spread Dow Corning sealant around the edge and seal ....
... hey presto .... no more leak when the tap is on!

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