There are lots of Roman valves in old villas or places like Pompeii.[1] As you say, the design hasn't changed much! [1] http://www.shinjovalve.com/news/let-s-t

There are lots of Roman valves in old villas or places like Pompeii.[1] As you say, the design hasn't changed much! [1] http://www.shinjovalve.com/news/let-s-talk-about-ancient-roman-valves.html http://www.shinjovalve.com/news/let-s-talk-about-ancient-rom...