We use 2 types of the orange cup automatic waterers. I believe the Edstrom waterers are the best, as the internal fittings are silicone and ours are now almost 18 years old with no problems at all. They also make the best trouble free automatic rabbit water nipples as well. The other type of orange cup waterer with the yellow stick thing they hit to release water are good, but the fittings are rubber and I recently had to replace all of them with silicone fittings. I should have done it as i first installed them and will if I order more. We have about 100 of these drink cups in use and prefer them to nipples as they don't drip, if installed correctly and fittings aren't rotten.