I have several used Plasson Bell waterers for sale, as well as some other "low flow" waterers. I'm not sure of the brand name of the other kind, but they sit on the ground and have a small float valve in the middle (covered by a cone). I use them to water baby chicks. The Plasson waterers work well for chickens, ducks, and turkeys. Next week I'm setting another up to water my geese, and assume they work well for that too. Both types work on a low-pressure system. I've hooked them up to both 5 gal buckets and 55 gal barrels. I've got about 15 of the Plasson, and several of the other type. I'll try to get picks up soon. Contact me directly if your interested.