Attach Bottom Cartridge Part and Wall Connection

What happens here

After the main cartridge and flange nut are secured, screw the remaining bottom part of the new cartridge assembly onto the threaded portion that extends below the urinal. This part typically includes the connection point for the wall drain pipe. Ensure this connection is also tight and properly aligned with the existing plumbing. The video confirms that the 'little piece connected to the wall' is now in place.

Goal: Complete the cartridge assembly and connect it to the drain.