VEVOR Pond Skins 20 ft. x 25 ft. Pond Liner 45 Mil Thickness Pliable EPDM Material for Fish/Koi Ponds Water Gardens, Black CTFSMHSEPDM20SZTDV0 - The Home Depot
Firestone EPDM Pond Liner Roll - 10 x 50 ft. (45 mil.) - Underwater Warehouse
45 mil EPDM Pond Liner 20'x25' & 20'x25' Pond Underlayment
Amazon.com : Firestone 45 mil EPDM Pond Liner 15' x 25' : Flexible Pond Liners : Patio, Lawn & Garden