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
BENTISM Pond Liner Fish Liner 10 x 15 ft 45 Mil EPDM Easy Cutting Underlayment - Walmart.com