It's a single fitment with two tap heads, one outlet to fill the bath and a tube up to a shower head. Press the ring down on the bottom of said tube, and the water comes out of sohwer head. Turn off the taps and then on again,water flows into bath.
but it isn't - it keeps comoing out of shower head. I presume some sort of return spring has failed or something like that - has anybody any ideas ? M
It's usually just crap/limescale preventing the water pressure acting on the changeover valve. Dismantle the valve and clean and descale. If you have some silicon grease to hand then a coating on all the parts before reassembly should do the trick. Descale the shower head while you are at it too.
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