On Sep 15, 6:33*pm, Larry The Snake Guy wrote:
On Sep 15, 5:35*pm, "Stormin Mormon"

wrote:
Do you mean remove the squeeze valve from the sprayer?

Sorry, what I meant was that one option would be to remove the whole
sprayer mechanism (including the valve) which might mean replacing the
faucet. If the sprayer gets used a lot, that might not be a good
option. Or maybe they could get a sprayer without a lever on it. That
way they are forced to turn off the faucet...

If they like the sprayer, adding check valves under the sink would
probably be a better option, which should take someone with a little
plumbing experience 5 minutes if you can find check valves with the
same thread size as the faucet lines (and if there are cutoff valves
at the sink).

Larry in dead-on about this...if you put a valve (sprayer) after a
mixing valve it allows a back-feed when there is a demand on the
cold...water passes through the mixer from hot to cold. HTMS

bob_v