This is everything needed to reseal SY accumulator control valves.  This is not for later SZ cars with throwaway spheres.  This kit includes all necessary EPDM o-rings, a new aluminum sealing disc and the aluminum washer for sealing the high-pressure adapter that connects the high-pressure line from the pump to the ACV.  It also includes a new bleeder valve  and new ball housing, a new mainspring a non-return valve tip.
New  piston seals are included also.  These require a special tool to install which is available separately.  Look under the "Tools" tab.  Or click here.
For early cars with brake switches attached to the valve, new aluminum and steel sealing washers are included.