"SPECIAL T HAVING EXTERNAL THREADED ROD PROTRUDING FROM 2 POINTS AND INTERNAL THREADING ON THE THIRD POINT; THREADED RODS ARE CONNECTED TO VALVE, HYDRAULIC PRESSURE REDUCER AND TUBE ASSY, BOOSTER PRESSURE, UTILITY SYSTEM, AND THE INTERNAL THREADING IS CONNECTED TO A CHECK VALVE; USED ON BOOSTER AND UTILITY HYDRAULIC PIPING, AT FUSELAGE STATION 617.0 TI 1012.0"