In an earlier contribution to this discussion,
Christian McArdle wrote:

I`d be a bit dubious too. That said, it would be about 10 mins work
to let in a short length of copper pipe on a couple of push fits.

If you were going to do that, you might as well do the job properly,
though. I've seen a pushfit 'T' with washing machine valve
preinstalled on the branch.

Just cut off the water, chop the pipe using a plastic pipe cutter,
insert metal collars, stick pipe into either end of fitting and turn
the water back on.

Christian.

I agree in principle - and would do something like that myself. A washing
machine valve isn't going to be the right size for a water filter, though,
so some reducing fittings will be required in addition. [I think washing
machine outlets are usually 3/4" BSP - whereas filters use something much
smaller - 1/8" BSP perhaps?]
--
Cheers,
Set Square
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