Purpose-built for vertical stacks, this ABS double sanitary tee cleanly joins two branch lines into a central drain for smoother flow in non-pressurized DWV systems. All-hub sockets are solvent-welded to Schedule 40 ABS, and the fitting aligns with ASTM D2661 and CSA B181.1, with third-party listings (cUPC/NSF/ANSI 14) for code-compliant installations.