Little Giant 1 Gal Poultry Nesting Jug Base Green Waterer + Layer Boost ComboLittle Giant 1 Gallon Nesting Poultry Waterer with Durvet Layer Boost combo. The transparent jar is molded from durable polyethylene so water level is always visible. Nesting style design makes attachment easy with enhanced stability. Nesting base ideal for chicks, bantams, and small poultry. Durvet Layer Boost contains vitamins, electrolytes, enzymes, omega 3, marigold, and live probiotics for daily use with layer chickens. Gravity fed design