IAPMO IGC 119-2019 covers water treatment equipment drain connectors and specifies requirements for materials, physical characteristics, performance testing, and markings.

This Standard covers water treatment equipment drain connectors, which are comprised of a reducer assembly, and air gap reducer assembly or a reducer wye. The reducer assembly and the air gap reducer assembly is designed to attached to the plumbing drainage system using a drainage tee, a diversion tee or a trap adapter. Such devices are intended to provide a transition connection from an appliance or water treatment equipment to the plumbing drainage system.