Access shall be provided to backflow preventers as specified by the manufacturer's instructions.
Outdoor enclosures for backflow prevention devices shall comply with ASSE 1060.
Backflow preventers shall not be located in areas subject to freezing except where they can be removed by means of unions or are protected from freezing by heat, insulation or both.
The termination of the piping from the relief port or air gap fitting of a backflow preventer shall discharge to an approved indirect waste receptor or to the outdoors where it will not cause damage or create a nuisance.