IPEX
A Reducing Tee is used to connect different diameters of pipe to each other at a 90 degree angle. Threaded hubs solvent weld to pipe.
3/8-In. x 10-Ft. Steel Pipe, Threaded, Black
Canplas 6" PVC DWV Cap Hub
Elkhart Products Leaded 90° Female Drop Ear Elbow
SharkBite Max Brass Push Coupling
Anderson Metals 5/8 In. Compression Brass Tee