We only had success with the nipples when installing them on small bottles for our brooders / isolation pens. When installed on large buckets, they leaked. Plumbers tape helped, but didn't entirely stop the leak.
We ended up buying the auto fill cups from Amazon. We installed 2 of them on a 5 gallon bucket about 2 or 3 weeks ago, and, so far so good!
https://www.amazon.com/dp/B09FDVY4YT?ref=ppx_yo2ov_dt_b_product_details&th=1
(We also used the cups with the yellow lever, which also didn't leak, but my chickens couldn't figure it out).
We ended up buying the auto fill cups from Amazon. We installed 2 of them on a 5 gallon bucket about 2 or 3 weeks ago, and, so far so good!
https://www.amazon.com/dp/B09FDVY4YT?ref=ppx_yo2ov_dt_b_product_details&th=1
(We also used the cups with the yellow lever, which also didn't leak, but my chickens couldn't figure it out).