Durafarm 100-Gallon Stock Tank Liners make livestock water management faster and less labor-intensive. Each liner fits inside a 4ft stock tank, locks in place with the included elastic bands, and swaps out in under 2 minutes so horses, cattle, sheep, and goats always have access to fresh, clean water without the labor of traditional tank scrubbing. This 5-pack includes the liners plus 2 heavy-duty elastic bands. The elastic band system cinches around the outer rim of the tank, holding the liner firmly in place while animals drink. When the liner needs changing, pull it out and drop in a clean one. No scrubbing, no chemicals, no wasted time. Compatible with all major 100-gallon, 4ft stock tank brands: Rubbermaid, Behlen Country, Tarter, Agrimaster, and Hastings. Works with both polyethylene and galvanized steel construction. The smooth, food-safe interior surface of each liner makes it easy to keep your tank maintained between swaps. These liners also extend the service life of cracked or aging galvanized tanks. The liner creates a waterproof interior barrier that seals minor cracks and prevents water loss, giving tanks that would otherwise need replacement a reliable second life. Made from food-grade BPA-free plastic safe for horses, cattle, sheep, goats, and all livestock.