VEVOR Pond Liner 13 ft. x 20 ft. 20 Mil Thickness High Tensile Tear-Proof Flexible HDPE Pond Skins for Artificial Lake, Black FS-1320T0.5MMHBQ6V0 - The Home Depot
WCP30 EasyWeave Woven Coated Polyethylene Pond Liners 30 Mil- per Sq. Ft. - Stoney Creek Fisheries & Equipment