Outdoor Duct Insulation Bag Backflow Cover - Insulated and waterproof protection: The backflow cover guards against subzero temperatures, wind, rust and water exposure. Thick insulating cotton provides warmth and moisture resistance, while the waterproof Oxford exterior keeps your sprinkler components dry. A backflow device prevents pipe freezing and helps save on bills. - Measure before purchase: To choose the correct size, measure the pipe and valve area before buying. Plan for 1 size larger if you are between sizes to ensure a proper fit. - Durable and secure: Constructed from thick, long-lasting materials. The bottom buckle prevents the cover from being blown away by wind. Two copper eyelets resist corrosion and can be locked with a chain to deter theft and increase security. - All-season protection: Designed to withstand sun, strong wind, heavy rain and snow. Be prepared for winter with this sprinkler backflow cover. - Practical use scenarios: - Protect a sprinkler backflow preventer and nearby piping in cold climates to prevent freezing. - Shield exposed irrigation valves on residential or commercial properties from wind and weather. - Use the copper eyelets with a chain in public or high-theft areas to improve security for outdoor irrigation components.