Merit Brass - Brass Pipe Nipple: Threaded on Both Ends, 3″ OAL, 1/2″ NPT - 02205110 - MSC Industrial Supply
British Tapered Thread to North American Thread Brass Hex Pipe Nipple 1/2" NPT Male - 1/
SUNGATOR Solid Brass Pipe Fitting, 1/2" x 1/2" NPT Male Pipe, Hex Nipple, For Use with Oil, Water and Air Lines Made from Copper, Brass or Iron Pipe ( 2-Pack) - Amazon.com