Red Brass Seamless Pipe Fitting, Close Nipple, Schedule 80, 3/8" NPT Male, 1" Length Nipple for connecting and extending pipes Male National Pipe Taper (NPT) threads for connecting female threaded pipes Made from brass for higher corrosion resistance than steel Made of Alloy 230 from seamless red brass pipe for greater strength and ease in machining than yellow brass Manufactured to standard NSF/ANSI 61 for use in drinking water supplies of pH 6.5 and higher