Medical sewer and drain cleaning. The sink in the nurses' station is blocked and not draining. Rodded under the sink from the accessible clean out 20 feet and opened up the drain line. The sink is draining as it should. In the men’s washroom, the vacuum breaker/gasket was leaking when flushed. Replaced the vacuum breaker and turned the water on to test and there was then an issue with the Sloan 3.5 gal flush vacuum breaker, so I replaced it as well. After turning the water back on, everything worked as it should with no leaks