The Cholila Cover Backflow Preventer Cover is a high-quality insulated fabric made of aluminum with an R21 insulation value, suitable for preventing backflow in pipes. Measuring 24"W x 30"H, this cover is designed to keep pipes warm and protected, making it ideal for outdoor settings where temperatures can drop to 5°F. The durable material and practical design make it a reliable choice for commercial and industrial applications where insulation and protection are crucial.