They learn from other rats, once they start drinking on their own they will start drinking from your watering system just like their parents.
Once they are 3 weeks old and you wean them they have no issue drinking out of a valve.
I have been breeding mice and rats for a decade (I produce 1000's each year) and never had any issue with animals not drinking from the valves and my rat tubs are about 6 inches high. I never once put a water dish
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