Quote: Agrees they drink from the cup, or what I call the 'lip'......and if there was hole in it, I don't think they wouldn't get enough water.
Some are very adept at draining the lip, others are not....some spill, splash and drip.
The orientation of the nipple in the vessel can make a difference, as well as how they use it, whether the lip will hold water.
Orienting the nipple so it will drain, if possible, might render it harder to use effectively.
Whether the water remaining in the lip will freeze or not would depend on environment...but if that remaining water does freeze, as I've observed when using them without a heater, it will keep the nipple pin from operating at all. What I saw was ice around the pin and spring on the outside and a knob of ice on the pin on the inside of the vessel....most the rest of the water in the vessel was fluid. I believe that the ice formed on the outside first, freezing the valve closed by jamming the spring...so I don't think it could freeze open and drain or make a huge pile of ice.. But I have seen icicles form on the cinder block under the nipples....I think this was from the sloppy drinkers rather than a leak.
Just my, sometimes anal, observations.
It hasn't been cold enough for long enough here to fully assess my set up yet. Lowest night temp as about 12F, lowest day temp maybe 19F.
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