Industrial sewer and drain service. The lavatory drain was backed up. I took apart the trap and rodded 20’ out with minor issues getting through. Hooked trap back up and everything drained as it should. In a second washroom, the flush valve was sticking and continued to flush nonstop. I replaced the Sloan flush valve diaphragm and vacuum breaker. Turned on the water, and everything is working as it should. A permit for each job was required, and all paperwork was completed and submitted. Everything was cleaned up and checked for leaks before leaving.