2410. NUMBERS AND CAPACITIES - BACKFLOW PREVENTION DEVICE, CARBONATOR

2410 NUMBERS AND CAPACITIES ─ BACKFLOW PREVENTION DEVICE, CARBONATOR 2410.1 A dual check valve with an intermediate vent preceded by a screen of not less than one hundred (100) mesh to twenty-five and four millimeters (25.4 mm) one hundred (100) mesh to one inch (1 in.) shall be installed upstream from a carbonating device and downstream from any copper in the water supply line, if not provided with an air gap as specified in § 2403. 2410.2 A dual check valve attached to the carbonator need not be of the vented type if an air gap or vented backflow prevention device has been otherwise provided as specified in § 2410.1. SOURCE: Final Rulemaking published at 50 DCR 4394 (June 6, 2003); as amended by Final Rulemaking published at 59 DCR 13690 (November 30, 2012).