Water backup on new double vanity/both sides - Home Improvement Stack Exchange
Can I change the original 2-sided kitchen sink plumbing using a T connection to drain both through the same down pipe and free up space in the cabinet? - Quora
SIMPLE DRAIN 1-1/2 in. White Rubber Threaded All-in-One Drain Kit for Double Basin Sink 3EA-1Q2-ZC0 - The Home Depot