Backflow preventer: Get a water pipe backflow preventer! Designed to: Protect your backflow pipe systems from frost, snow, rain, wind and sun. Ideal for: Backflow devices with a width under 14". Colours: Choose beige or grey. Size: Measures 40cm x 50 cm. Material: Made using 600D oxford fabric and PP insulated cotton. Water Pipe Backflow Preventer | Beige | Living Social