These master cylinders feature a reliable seal/piston design with a high pressure die cast aluminum body and 1.1" of piston stroke. The integral reservoir holds 10 oz. of brake fluid. The 1/8" NPT outlet port is shrouded underneath the reservoir to minimize the chance of fitting damage. An internal baffle with reservoir to keep port covered with fluid if reservoir runs low. An expandable bellow forms a tight seal and expands to fully fill the reservoir and enable full fluid volume to be utilized. A high-tensile spring steel bail wire provides consistent clamp force onto lid.