SmartLine 21' Round Rock Island Overlap Above-Ground Pool Liner — 48"/52" Height, 20 Gauge

Engineered for above-ground pools, the SmartLine 21' Round Rock Island Overlap liner is a 20 Gauge, 48"/52" height replacement designed and produced in the USA by pool industry professionals with over 50 years of experience. Constructed from 100% virgin vinyl, this liner offers built-in UV protection and resists punctures, cracking and fading. Each liner is hand-folded to help ensure an easier, wrinkle-free installation. The material endures harsh pool chemicals and prolonged sun exposure, performing reliably across a wide temperature range from -50°F to 130°F. A gasket set is included to prevent leaks and is compatible with all thru-wall skimmers and water return lines.