●L-shaped Opening for Hassle-free Fitting: allows the insulation cover to adapt to a wide variety of installation requirements for backflow preventers and pipes, providing comprehensive protection. ●Robust and Durable Construction: Crafted with heavy-duty, five-layer thick material, this insulated cover ensures durability and resists all forms of adverse weather. ●Secure and Efficient Insulation: The robust Velcro seal at the bottom of the cover ensures a firm closure, maintaining high-quality insulation and protecting your systems effectively. ●Additional Security with Grommets: The cover is designed with grommet holes, providing extra security and keeping the pouch firmly in place. ●Precise Size for Perfect Fit: The backflow insulation cover measures 16W x 20H. We recommend measuring your backflow preventer before purchasing to ensure an optimal fit.