Universal Ozone injector with 3/4" ribbed barbs for your main water lines and a 1/4" ribbed barb for your ozonator. This part helps to create a vacumm or venturi that pulls the ozone gases out of your ozonator and injects it into your spa water. Can be used to make your spa ozone ready or to replace older models that are outdated. Always verify the direction of your water flow when you install these injectors. This model replaces the smaller injectors made by Prozone.