And prices may varies within different conditions. Travel and mileage may be applied. Calling our office is the best way to understand the charges and what information is needed to send a Technician to our site. We carry a wide variety of sizes. Our blankets are lined with blue jean insulation and are hand crafted. It has become a mandatory requirement on all new installations with City of Tucson to weather protect your backflow preventor. The blankets recommended and sold through us are for protection from hot and cold temperatures.