Beak height varies with age, breed and sex. It could be 2 inches for a Serama chick or 3 feet or more for an adult Malay rooster.Yes, as I mentioned I'll be using horizontal nipples. I understand beak height but what is the beak height? Can't seem to find anything on bird heights.
I get putting a cap on the end for cleaning but how do you clean the inside of a pipe that's say 3 ft long?
Best bet if using a bucket is to hang it and keep raising it as your birds grow.
They make wire or sponge brushes on long wire rods for cleaning.