Description: 【Material】: Our Backflow Preventer Cover is made of 1 layer of waterproof heavy duty Oxford cloth, 2 layers of cotton insulation, and 2 layers of aluminum foil. This material ensures maximum safe, waterproofing, and thermal insulation 【Fit】: Specially designed for pressure vacuum breakers, this Backflow Cover perfectly fits over your system to protect it from harsh weather conditions such as heavy snowfall and sunlight 【Ultimate Protection】: This Back Flow Cover safeguards your return piping system from freezing or bursting in extreme weather conditions. It helps avoid expensive annual valve replacement and repair costs by providing an extra layer of protection against snow, rain, wind, and heat 【Easy Installation】: Simply place the Well Pump Cover on the pipe and secure it with the buckle provided. Grommets can also be locked with a chain to prevent and increase security 【Versatile Use】: Not only does this cover protect backflow equipment but it's also ideal for safeguarding irrigation systems or lawn sprinkler systems from freezing or sun damage Specification: 33cmx30.5cm/12.99inchx12.01inch Package Includes: 1 Backflow Preventer Cover  Note: Please allow slightly errors 1-2cm differences due to manual measurement.