Male NPT to reduced male NPT
Male NPT both ends
Male NPT to male ISO tapered
Male NPT to male ISO parallel
 - GNH Picture.JPG "Hex Nipple (Male to ISO) GNH")
 - GNH Picture.JPG "Hex Nipple (Male to Male) GNH")
 - GNL Picture.JPG "Hex Long Nipple GNL")