Backflow Cages & Enclosures

Setting up a backflow preventer enclosure is fairly straightforward. Simply place the backflow cage over the backflow device and secure it with bolts or locks. Some backflow enclosure cages may require anchoring to the ground or attaching them to a nearby structure for security.

Common cage sizes will accommodate standard residential and commercial backflow devices. Typical cage dimensions range from about 16" wide and 12" tall for smaller residential units, while larger cages may be 24" wide or more.

A backflow cage alone does not protect against freezing temperatures. Its main purpose is to protect the backflow preventer from theft, vandalism, or accidental damage. To help prevent freezing, a backflow preventer should be covered with an insulated backflow cover or enclosure, which is sometimes installed over or inside the cage. In colder climates, additional protection may also be recommended.

While it is unnecessary to give the Water Department keys to your backflow cage, it is a good idea – and sometimes required, depending on where you live – to give your maintenance department a key to the lock on your backflow preventer cage. Then, in case of an emergency, they can access the backflow preventer and perform any required tasks, whether you are on the property or not.