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IAPMO PS 23-2021ae2
Industry Standard for Dishwasher Drain Airgaps
This Standard covers dishwasher drain airgaps with single or multiple inlet ports intended for use with ordinary domestic type automatic dishwashers connected to the sanitary waste system, and specifies requirements for materials, physical characteristics, performance testing, and markings.
International Association of Plumbing and Mechanical Officials [iapmo]