2403. DESIGN, CONSTRUCTION, AND INSTALLATION - BACKFLOW PREVENTION, AIR GAP

2403 DESIGN, CONSTRUCTION, AND INSTALLATION ─ BACKFLOW PREVENTION, AIR GAP 2403.1 An 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). P SOURCE: Final Rulemaking published at 50 DCR 4394 (June 6, 2003); as amended by Final Rulemaking published at 59 DCR 13690 (November 30, 2012).