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[GaryBC]

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One last question. Is there a torque setting for tightening this valve? Although the valve itself is quite hard, it screws into a light alloy boss welded to the pipe - easy to screw off if not careful! ......

No idea about torque settings, but as you say you're screwing it into an ally fitting on a thin walled ally pipe so go easy, little more than a nip is needed - the green Viton O ring is doing the sealing. There's a union underneath for a spanner (17mm  :-/ 19mm  :-/) to support the pipework while you remove or refit the fill valve. When tightening the valve up just remember that apart from the hassle of fitting the pipe, it's over £100 to buy new. That alone should prevent you from over tightening it. 

Hence the question!  It was pretty tight to get off but I think that was just age!! (Tighter than I think it should have been - it was a white and three reds to shift the bloody thing!!)