Homeowner wanted to install a vanity in the bathroom and the drain line had failed. Cut open section of drywall to access the drain piping. Secured the 4 inch cast iron stack in the attic. Cut out 4 inch sanitary tee and installed new pvc 4 by 1-1/2 sanitary tee for the lav drain line. Secured with husky bands and ran new piping to the lav sink. Cut out floor board ps to install the vanity and screwed into place. Applied silicone to secure the sink. Ran new P trap to the drain and connected the faucet. Tested and the drain is working properly. Secured vanity and everything is working properly at this time.