【Dimesnsion】 12.95in x 12.15in x 8.78in (top/ height/bottom). This is a well-made insulated cover for an outdoor backflow preventer pressure vacuum breaker. Measurement is required before you purchase to ensure a perfect fit for your backflow device. 【Usage】 Backflow insulation pouch for outdoor backflow preventer for winter freeze protection, for summer sun-exposure protection. Cover up your outdoor pressure vacuum breaker like an enclosure cage, which helps you prevent your backflow preventer device from freezing. 【Material】 Outer Layer is UV-resistant/waterproof 600d Oxford fabric double-stitched in each seam to seal out all thick insulation core elements and prevent splitting during long-term use. The insulation core is a thick layer of insulation that provides optimal thermal insulation protection and minimizes gaps that could cause backflow freeze-up problems in cold winters. 【Easy install】 Our insulated pouch can be secured on your backflow preventer in place, with a windproof hook & loop fastener inside. Grommets and adjustable straps can also be installed for backflow devices that require a partially open bottom and side. Protect your backflow system. Minimize some occasional damage from your kids and pets. 【After-sales Support】 We aim to provide excellent products and positive experiences for customers. If our products fail to live up to your standards, you may return them in 60 days for a replacement -no questions asked!