Everflow Supplies NPBR3840 4" Long Brass Nipple Pipe Fitting with 3/8" Nominal Diameter and NPT Ends Everflow part number NPBR3840 Brass 4" long nipple 3/8" Nominal pipe diameter with male threaded NPT ends Conforms to ASTM B687 ans ASME B1.20.1 Meets or exceeds all applicable ANSI standards