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406.1 Water Connection
The water supply to an automatic clothes washer shall be protected against backflow by an air gap that is integral with the machine or a backflow preventer shall be installed in accordance with Section 608. Air gaps shall comply with ASME A112.1.2 or A112.1.3.
406.2 Waste Connection
The waste from an automatic clothes washer shall discharge through an air break into a standpipe in accordance with Section 802.4.3 or into a laundry sink. The trap and fixture drain for an automatic clothes washer standpipe shall be not less than 2 inches (51 mm) in diameter. The fixture drain for the standpipe serving an automatic clothes washer shall connect to a 3-inch (76 mm) or larger diameter fixture branch or stack. Automatic clothes washers that discharge by gravity shall be permitted to drain to a waste receptor or an approved trench drain.

Related Code Sections

Section 406 Fixtures, Faucets and Fixture Fittings, Automatic Clothes Washers
The water supply to an automatic clothes washer shall be protected against backflow by an air gap that is integral with the machine or a backflow ...
Section 406 Fixtures, Faucets and Fixture Fittings, Automatic Clothes Washers
The water supply to an automatic clothes washer shall be protected against backflow by an air gap that is integral with the machine or a backflow ...
406.1 Fixtures, Faucets and Fixture Fittings, Water Connection
The water supply to an automatic clothes washer shall be protected against backflow by an air gap that is integral with the machine or a backflow ...
406.2 Fixtures, Faucets and Fixture Fittings, Water Connection
The water supply to an automatic clothes washer shall be protected against backflow by an air gap installed integrally within the machine conforming ...