Mazzei - 978 Series - 1.0” Male NPT Inlet/Outlet Connections (0.50” Barbed/Male NPT Threaded Suction Port Cap)Mazzei Injectors Mazzei 978 Series Venturi Injector 1. 0" NPT connections with 0. 50" suction port patented differential pressure design with internal mixing vanes for superior chemical and gas injection No moving parts Wide pressure range Microbubble mixing NSF FDA materials The Mazzei 978 Series venturi injector uses differential pressure to draw chemical or gas additives into your water stream with minimal pressure loss. With 1. 0" male NPT inlet