Robust build, elegant design, standard 1/4" threads, standard 1/4" poly tubing. Cast heavy duty plastic housing with no moving parts to break. just a ball that is displaced when water (chemicals) flows through it. Must be mounted vertically to work properly.
When feeding chemicals it can be tricky to diagnose problems, this visual flow indicator doesn't tell you the flow, but if there is flow which can save a lot of time.