BKF 44-2/18.375/NPT BKF 44-2/M18 BKF 44-3/14.5/NPT BKF 44-3/M18 BKF 44-4/14.5/NPT BKF 44-4/14.5/NPT/S717 BKF 44-5/14.5/NPT BKF 44-5/14.5/NPT/S717 BKF 44-6/14.5/NPT/S717 BKF 48-1/M18