Drains: use ABS rather than PVC or chrome – Deborah's Home Repairs
Charlotte Pipe 1-1/2-in x 1-1/4-in ABS DWV Reducing Adapter in the ABS DWV Pipe & Fittings department at Lowes.com
Charlotte Pipe 3-In ABS Coupling for Non-Potable Water - Black ABS DWV Pipe Fitting for Sanitary Drainage Applications - Schedule 40 - NSF Safety Listed in the ABS DWV Pipe & Fittings
Metric Female Coupling | CoralVue
NIBCO 2 in. x 1-1/2 in. ABS DWV Hub x Hub Reducing Coupling C5801HD2112 - The Home Depot