"CONNECT PORTS (NO. 6) HAVE 20 THREADS PER INCH AND CONNECT TUBE SIZE IS 0.250 INCHES; CONNECT PORTS (NO. 7) HAVE 18 THREADS PER INCH AND CONNECT TUBE SIZE IS 0.375 INCHES; CONNECT PORTS (NO. 8) HAVE 16 THREADS PER INCH AND CONNECT TUBE SIZE IS 0.500 INCHES; ALL FLUID PORTS ARE THREADED O-RING SEAL, STRAIGHT IN TRUNCATED HOUSING; PROOF PRESSURE IS 9000 PSI AND BURST PRESSURE IS 18000 PSI; MATERIAL IS ALLUMINUM ALLOY 7050 -T-7451 PER AMS 4050"