In message , Timothy Murphy
wrote


That wasn't quite the question.
The kit comes with what is called a pressure reducer,
which is said to improve performance.
But the instructions are ambiguous
as to which side of the timer it goes.
Maybe it doesn't matter ...

It should matter but physically you don't want to hang the timer off the
pressure reducer. The timers are relatively heavy and are better
installed as close as possible to a pipe/tap that is firmly attached to
a wall or post.

If the timer is fitted to tap or service value pressure reduction can be
achieved by turning off the tap or valve a tiny bit. Both my timers are
attached to outside taps and with no pressure reducers. They have been
working this way for years without problems. The pipes connected to the
taps have inline double check valves to stop any contaminated water
getting back into the supply.

Use decent batteries!
From experience, these type of devices don't like rechargeable
batteries.

Don't use pound shop special value batteries - they will fail on the
hottest day and then leak destroying the batter terminals.

I use Duracell ProCell which have a 7 year shelf life and last for a
year running twice per day in the spring/summer/autumn and perhaps once
every 5 days in the winter. I change the batteries each Spring even
though they may still work
http://cpc.farnell.com/jsp/level5/module.jsp?moduleId=cpc/258144.xml
note: the link above is possibly not cheap for small orders - use Google
to find Procell batteries

--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk