Bathroom Basin Flexi-pipe sizing.

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Hello, I'm changing basin taps on a low pressure supply/system so will be joining 15mm copper with 15mm compression with isolation valve x 1/2" flexible pipe connector. Should I be concerned at the flexi pipe bore size, as the majority appear to be 10mm, although there do appear to be some that are 13mm bore. On a low pressure system, will there be much difference in the water flow? Thanks

 
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Yes, if it's a gravity system (fed from a cistern in the attic) then the bore of the flexi can reduce the flow, will it reduce it to the point where you'll really notice is another thing. If you can get the larger bore flexi's then fit them.

Only other thing I would note is that if the tap is using flexi's then make sure it's designed for low pressure, some mixer taps aren't, as that will affect the flow too.
 

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