[Customized Design] Our Backflow Insulation Pouch is specially designed for Pressure Vacuum Breaker, and it matches perfectly with Pressure Vacuum Breaker. Protect your Pressure Vacuum Breaker from Severe Snow and Intense Sun. [Avoid High Repair Costs] Protects your backflow pipe systems from freezing, bursting, and blowouts due to severe weather conditions like snow, rain, wind, and sun exposure heating. Avoid expensive costs of valve replacement and repair every year. [Easy To Install and Stay Sturdy] Put the cover on your pipes and close it with the Nylon Sticker Strips. We also prepared some extra nylon ties to fix it and keep your insulated pouch in place. No worry to and the wind blowing it . The grommets also can be locked by Chain to prevent being taken by theft, increasing security. [5 Layers Design Insulation & Waterproof] Made of 1 Layer Waterproof Heavy Duty 600D Oxford Fabric, 2 Layers Cotton Insulation, 2 Layers PE Sliver Coated Cloth. Double stitching for max security has both waterproof and insulation effects. Keep the Backflow Device / Irrigation System / Lawn Sprinkler System from freezing or sunning. Colour:Black & White Material:Oxford cloth + cotton Size:About 30.5x33cm Package Contents: 2 * Antifreeze cover Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.