Arrived on site to winterize outdoor rinse station and perform plumbing inspection. On the plumbing inspection I found that an emergency shutoff valve was hard to turn by hand. Made customer aware and due to the fact that all shutoff valves are the same client would like to just replace all at once. Valves for outdoor shower are now off for the winter. Today in total I replaced 8 shutoff valves and when done I turned the water back on to test for leaks. There are no leaks at this time.