On 2 May, 09:57, Andy Champ <no....@nospam.invalid> wrote:
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>
> What kind of shower?
>
> Tank outlet if all else fails.
>
> Andy
Sorry, it's an electric shower fed straight off the mains. There is
already an isolating valve on the main pipe that feeds the shower but
that also feeds the bath, washbasin etc., and I think a separate
isolating valve is necessary for the shower.