Features: 1. 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. 2. 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. .