7 gallon nipple waterers for poultry: these are especially great for waterfowl who like to mess their water ALL THE TIME. If you don't enjoy changing dirty water twice a day, or dealing with inevitable illness and losses because you choose not to, these are for you. A single 7 gallon waterer lasts our 20 or so birds a full week, and only needs to be scrubbed every 3 months or so. A heat lamp suspended over the top keeps water from freezing in a secure henhouse. Each waterer has 4 nipples, a tight-fitting lid with a fill hole, and 4 suspension ropes to keep weight evenly distributed. Birds quickly learn to drink from these with no help from you. 7 gallon waterers are $20 each, and extra nipples can be added for $3 each. Shipping is $15 to anywhere in the contiguous U.S. PM for Paypal address.