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"Standpipes must be individually trapped. Standpipes shall extend a minimum of __________ and a maximum of __________ above the trap weir. Access shall be provided to all standpipes and drains for rodding. A. 18 inches (457 mm), 42 inches (1066 mm) B. 12 inches (304 mm), 36 inches (912 mm) C. 20 inches (508 mm), 30 inches (762 mm) D. 18 inches (457 mm), 36 inches (912 mm)!"
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