Shut Off Valve, 1/8" NPT, Aluminium, Red, Each. Automotive / Aerospace-quality Black Anodised Billet Aluminium Inline Shut Off Valve. Thread size = 1/8" NPT. 1xBrake Line Lock Shut Off Valve. Designed to be installed in-line in a hydraulic brake line system to enable locking of the front or rear brakes.