This 1/2-inch threaded injection nipple is used to inject chlorine, pH-, or pH+ into a pool pipe. A flexible hose can be attached to the nipple at the bottom of the injector to carry the injected substance further away from the injection point, allowing you to physically separate the injection of acid and chlorine.
The injection nipple has a built-in rubber check valve to prevent pool water from leaking out. It also comes with a rubber seal, so Teflon or Filetplast is not needed during installation.