Hello all, I'm wondering about the Little Giant 7 gallon plastic waterers. I'm looking at getting one soon for my flock, but I'd like to know if it is top filling. The only info I found was from fleming outdoors or something and they only state that it has a vacuum sealed top. (Well, duh what one isn't going to.) Anyway, do you know if these are top filling as in the black cap unscrews and you don't have to turn it upside down, sideways, etc, to fill? I'm guessing that the 3 and 5 gal sizes are similar. I'm looking to make watering easier for myself and anyone who tends to my flock while I am away. Other recommendations will be greatly appreciated in the field of 5 gal+ size waterers!