P-RKF 40D-2 P-RKF 40D-2/M20 P-RKF 442-0.3 P-RKF 442-0.3/14.5/NPT P-RKF 442-0.3/14.75/NPT P-RKF 442-0.3/M20 P-RKF 442-0.5 W/LN P-RKF 442-1 P-RKF 442-1.5/14.5/NPT P-RKF 442-1/14.75/NPT