From Amazon:
https://www.amazon.com/dp/B089XZVZMP?psc=1&ref=ppx_yo2ov_dt_b_product_details&tag=backy-20
After a couple of weeks of use, I've noticed some issues:
- They all loosened up and started to leak a bit, because the chickens knocked them around a little bit. Once turned sideways a little, they don't seal. I had to pry lids off and tighten them all again. Monitoring this to see if it's a regular issue, or just a one-time adjustment that needed to be made after installation.
- One of the cups broke already. The cup part has little plastic knobs that fit into the housing of the valve part, so that the cup can rotate up and down slightly. One of those knobs broke off, allowing the cup to tilt sideways and opening the seal. I fixed it by slicing off the remaining knob, drilling through the cup where the knobs used to be, then reattaching to the valve part by putting a tie through both sides and around the top. It works fine now, but of course I'll be watching for any other failures.
In hindsight, I probably wouldn't buy these again. I'd look for something more durable, and if there are moving parts, made of nylon or metal.
If you (or anyone else) gets these, I recommend finding a permanent location so that you do NOT have to carry the buckets around, but drag a garden hose around instead. The cups are far too fragile if you knock them against something; probably why mine broke. I now have them set up on a pair of stacked circular patio blocks, about an inch in diameter wider than the base of the bucket. That's so that the block doesn't interfere with the motion of the cups. Be sure you drill the holes high enough on the bucket so that when it sits on the ground, the cups do NOT touch the ground. I'd drill 1/4-1/2" higher than what the instructions say to do.