To plumb a bathroom sink, first install the faucet and drain assembly according to the manufacturer’s instructions. Connect the water supply lines to the faucet and ensure they are tightly secured. Install the drainpipe, making sure all connections are sealed properly to prevent leaks. Test the system by turning on the water supply and checking for any leaks or issues.

Install faucet and drain, connect water lines, secure all fittings, and check for leaks.