Although the intent of this type of covering is sure, the reliability of such a covering is low. It might accomplish is purpose in the winter months but there are certainly no guarantees. To top it off, this kind of covering is just ugly. First impressions are important for any home or business and this sight subtracts from any landscape, leaving a bad impression on people.
Details are important.
Warner Backflow can remedy this ugly problem and provide freeze protection in the process. Durability - If you use this type of covering, it won't last. It must be replaced every winter. Security - The cover does not completely enclose the backflow device which encourages tampering with or vandalizing the device. Drunk people punt backflows.