Hydraulic clutch slave cylinder assembly for most Guzzi big twins with 5 speed transmissions. Replace the clutch cable with a hydraulic system of your own design using this slave cyilnder. Hydraulic system reduces effort required to operate the clutch. Design uses two orings on the aluminum piston and two seals on the stainless steel shaft. Accepts standard metric brake banjo bolt with 1.00 thread pitch. Minimum suggested master cylinder bore size is 13mm. Requires hose and fittings, and hand master cylinder to operate. Use DOT 3 brake fluid. * Note the resistance to movement on a new unit is significant, it is not a problem for the hydraulic system and will settle in with use.