Trevi TT shower valve - fibre washers

Having trouble with a Trevi TT shower valve. It comes with the inlets and outlets threaded to take MI couplers but can I heckers like find fibre washers of the correct size to seal coupler to valve body which would be:
Internal diameter 27mm External diameter 33mm Thickness 2-3mm
Found a specialist who can make em - but due to minimum quantities/labour, you're looking at ?40! (and I just need 3 not 25!).
I've got some that loosely fit but as I'd have to use two to get the thickness, it will leave the joint a bit iffy I think.
Any ideas?
TIA Midge.
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"Midge" wrote:

Is what you need here? <http://www.showerdoc.co.uk/shower-spares/trevi/TT%20Valve.html
If not, phone/e-mail 'em and they may have the bits.
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Thats the valve alright - but it doesn't show anything against the two inlet ports, and the outlet. Thanks for the suggestion on calling Ideal Standard - I may end up doing just that.
Midge.

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"Midge" wrote:

In that case, perhaps it is not meant to have fibre washers. Just a diy thought - I know nothing about this shower.
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