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Isolation valve wont fit ?

HI, I`m trying to fit a isolation valve to a basin tap but when trying to tighten the nut to the valve with the olive in between on a 15mm pipe, seems far to loose on pipe, and just comes straight off. Any advice anyone please ??
Sarah (trying to save money), May 2011
The nut will not bite until you put pressure on with a couple of turns of the spanner.
It will appear to be loose under finger tightening.

Big Softy, May 2011