This Tilton Brake Proportioning Valve Repair Kit comprises the seals required to service all v ersions of Tilton Brake proportioning valve (also known as Tilton brake bias valve). The seals are the same for all versions of the valve so this is suitable for use lever and knob type brake proportioning valves with either metric or UNF fluid ports i.e. Tilton part numbers 90-1000, 90-1003, 90-2000 and 90-2003.