Tap-It, Opaque Blue, 4 Gallon, Tap Poultry Flock Drinker, Birds Naturally Know To Tap The Drinking Nipples For Consistently Fresh Water, Container Helps To Inhibit Algae Growth, Holds Up To 4 Gallons 18 Liters Of Fresh Water, Hinged Lid For Easy Access Filling, Versatile Suspension Hook For Adjustable Height, Made From Food Grade PBA Free Plastic.