Mazzei 1078-03-PP 1" Injector **Only Online Authorized Distributor of Mazzei Ag Injectors** Model 1078 Injector Unit Inlet & Outlet: 1" MNPT Suction Port: 1/2" Barb; 1/2" MNPT Thread Please visit www.mazzei.net/venturi_injectors/ for more detailed information