Total Length (incl. blue seal): 87.2mm Spindle Length (from top of circlip to end): 48mm Spindle Diameter: 9mm Spindle teeth head Diameter: 7.8mm Barrel Diameter: 23.8mm Lower Thread: 26mm Upper Thread (closer to spline): 23.8mm This is a long stem replacement flow cartridge for Hudson Reed triple shower valves. If the shower valve has a thermostatic cartridge, there will usually be two ceramic disc cartridges installed on either side of the cartridge. If you need both, you must purchase two, as the cartridges are sold individually. This cartridge is a 3/4 inch quarter turn on/off with ceramic discs that turn anti-clockwise. (Cold Side - Clockwise Close) This CD valve cartridge has a threaded collar.