For standard 1-1/4" washing machine waste hose adapter needed for other sizes
1/2" softener waste port glue in, or you may thread tap port.
Your choice of one glue in fitting with each airgap. (Glue in fittings have 5/8" and 1/2" barbs on them or sized to fit 1/2 CPVC or 1/2" Sch 40 PVC fittings)