Mazzei - 784 Series - 0.75" Male NPT Inlet/Outlet Connections (0.25" Barbed Suction Port Cap)Mazzei Injectors Mazzei 784 Series Venturi Injector Differential pressure injector with 0. 75" NPT connections and internal mixing vanes for efficient chemical or gas injection into water streams 0. 75" Male NPT 0. 25" Barbed Suction No Moving Parts WHY IT WORKS Venturi Principle with Precision Engineering Venturi Vacuum Generation Pressurized water is constricted into a high velocity jet stream through the injection chamber, creating a vacuum that