Sonnax bore sizing tool 36948-12 smooths and deburrs accumulator control valve bores to permit salvage of accumulator bodies. This tool allows the bore to be properly resized to prevent hang-up of valves. * Prepares bore for installation of performance rated accumulator spring kit [36948-18K] and installation of OE accumulator control valves and accumulator control valve kits [36948-09K] and [36948-13K]