Extending old mains water pipe

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I need to relocate our Stop Cock and extend the mains water supply running under our suspended floor approx 4m. The house was built 1973 and the mains water supply appears to be some sort of plastic but not modern blue MDPE. Will a standard MDPE 25mm coupler likely fit so I can just extend the old mains pipe? I was then just going to put a reducer at the end of the new MDPE run for a Stop Cock and then conventional copper tubing. Or could I run from the stopcock to join the current cold water pipe feeding the rest of the house with plastic pipe?
 
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Assuming you have black alkathene then the black Philmac fittings claim to be universal and fit black and blue. I'd rather use a Plasson fitting, they do a black 1/2 or 3/4 to 25mm fitting.
 
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