Section 25-B1405. DESIGN, CONSTRUCTION, AND INSTALLATION - BACKFLOW PREVENTION, AIR GAP*

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1405.1An air gap between the water supply inlet and the flood level rim of the plumbing fixture, equipment, or nonfood equipment shall be at least twice the diameter of the water supply inlet and may not be less than twenty-five millimeters (25 mm) or one inch (1 in).

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Final Rulemaking published at 56 DCR 5245 (July 3, 2009).

                    
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