drinker bowl valve rubber

i take it bull that it's a tapered washer when its new?
and the tapered bit fits into the spout to stop the water?
 
Yes tapered like a sort of a cone . The push lip presses against the right hand end of the stem in the picture , and lifts the rubber against a brass spring on the right hand end , opening the valve seating . The rather tatty one in the pic is out of a scrap bowl just for illustration .
 
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