Chemical Injectors Material:brass CW614N Sizes:1/4" hose barb Nozzle size :1.6mm,1.8mm,2.1mm,2.3mm Pressure Washer Parts -Chemical InjectorsMaterial:brass CW614N(CuZn39Pb1)Surface brass colorCNC MachiningSizes:1/4" hose barbNozzle size :1.6mm,1.8mm,2.1mm,2.3mm3/8" Male thread inlet3/8" Female thread OutletEPDM O-ring4000 PSI 3/8" Chemical Injector Fixed , Pressure Washer Chemical Injector