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Inspection and testing shall comply with Sections 505.3.1 and 505.3.2.
505.3.1 Inspections
Inspections shall be made of all backflow assemblies and air gaps to determine whether they are operable.
505.3.2 Testing
Reduced pressure principle backflow preventer assemblies, double check-valve assemblies, double-detector check valve assemblies, and pressure vacuum breaker assemblies shall be tested at the time of installation, immediately after repairs or relocation and at least annually. The testing procedure shall be performed in accordance with one of the following standards: ASSE 5010-1013-1, Sections 1 and 2; ASSE 5010-1015-1, Sections 1 and 2; ASSE 5010-1015-2; ASSE 5010-1015-3, Sections 1 and 2; ASSE 5010-1015-4, Sections 1 and 2; ASSE 5010-1020-1, Sections 1 and 2; ASSE 5010-1047-1, Sections 1, 2, 3 and 4; ASSE 5010-1048-1, Sections 1, 2, 3 and 4; ASSE 5010-1048-2; ASSE 5010-1048-3, Sections 1, 2, 3 and 4; ASSE 5010-1048-4, Sections 1, 2, 3 and 4; or CAN/CSA B64.10.

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505.3.2 Plumbing Facilities and Fixture Requirements, Testing
Reduced pressure principle backflow preventer assemblies, double checkvalve assemblies, double-detector check valve assemblies, and pressure vacuum ...