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there is one thing you could try get a 150m coil of 10 mm pex pipe disconnect one of the flow and returns from the manifold and feed the 10mm through the 16mm under floor loop apply a little lubrication ideal yellow 77 wire and cable pulling lubricant will help available from screwfix I cant guarantee it will work but worth a try tape the end of the 10mm pipe 16mm to 10mm adaptors are available best of luck kop
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