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Water supply pipe to plumbing fixtures, water using appliances and equipment, wall hydrants (except fire hydrants used for fire fighting) and hose bibbs shall meet the following requirements:
1. No plumbing fixture shall be installed unless the water supply enters said fixture with an air gap of twice the internal diameter of the water supply pipe but not less than 1 inch (25 mm) above the flood level rim of the fixture, except for fixtures listed in Section 18-29-423 of this article.
(Amend Coun. J. 11-9-16, p. 36266, § 37)
2. Dishwashing machine and clothes washing machine water supply pipes shall have an air gap as required for plumbing fixtures, except that dishwashing machine water supply pipes may enter through an approved atmospheric vacuum breaker located on the discharge side of the last control valve. The bottom of the vacuum breaker shall not be less than 6 inches (150 mm) above the flood level rim of the machine or related equipment.