I've used the standard red nipples, drinker cups, the Little Giant auto fill fount bowls and now I'm redoing an old system (which has 10 yr old auto fill founts) with the horizontal nipples that Rich sells. So far I like these a lot and the birds went to the first one and started pecking before I even turned on the water. When the water came on they had a party, you would of thought I had filled it with moonshine at a country party. I should have the system finished before the day is over and will post up some pics and a complete review when I'm finished.
Just a quick thing about the horizontal nipples is they have a really neat tapered thread that doesn't leak. I put them in pvc tees with 1/8" threads but I can see how they would screw into the proper size hole in a bucket or jug or just in a pvc pipe as long as the proper size hole is drilled. The tapered threads don't even need Teflon tape and as you tighten them up the threads get bigger and bigger and grip really strong with a super nice fit in whatever you screw them in.
Just a quick thing about the horizontal nipples is they have a really neat tapered thread that doesn't leak. I put them in pvc tees with 1/8" threads but I can see how they would screw into the proper size hole in a bucket or jug or just in a pvc pipe as long as the proper size hole is drilled. The tapered threads don't even need Teflon tape and as you tighten them up the threads get bigger and bigger and grip really strong with a super nice fit in whatever you screw them in.