Engineered for high-performance fluid control, the R4 and RG4 series combine a precision orifice with a robust metal gasket, purpose-built for face seal fittings. Choose from premium material options—including stainless steel or nickel, with or without silver plating—to match your exact chemical, pressure, and temperature requirements. These orifices deliver reliable, leak-tight performance where accuracy and durability matter most.  The RG4 is equipped with a gasket retainer, making resuse or replacement much simpler.