Low Water Pressure


I recently had a kitchen extension built but I'm having problems with the hot and cold water pressure. These were both ok before the extension.
There are, I believe, 2 possible reasons for this:
1) The mixer tap: I can't now remember the specification for the tap but it does have two very small flexible hoses that I'm concerned are affecting the flow.
2) The sink only moved about 2 meters but the plumber used flexible hose instead of copper embedded in the concrete kitchen floor. I'm concerned that these hoses may have become partly crushed.
Which do you think is the most likely cause?
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I think it's eminently possible that the flexi pies buried in the concrete are the culprit. I'm astonished that a plumber would do that instead of using copper. Is it concreted in, or did he just chisel out a duct for the pipes? If they were concreted in, there's going to be a problem sooner or later anyway, when the flexi pipes perish. I assume you mean the rubber(neoprene or whatever) type with a wire braid outer sheathing?
Even if they're not crushed, I'm not convinced that they have the full 15mm bore all the way through anyway, trying to remember last time I saw in the end of one.
If they are not subject to mains pressure, and certainly the hot supply won't be, they would restrict the flow.
I'm not a plumber, but I think your plumber is an idiot.
Steve
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It's a new mixer tap with microbore pipe tails? Then it isn't meant for low pressure water supplies at all. The inner head gear can be changed on some styles of these taps, but you have to ask the makers or get the instruction manual to find out if yours can.
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