Unfortunately, valve rubbers are no longer available for pumps with an AVACS pump head. The valve rubbers used in current pump models are not compatible with the AVACS system.
For mini pumps with an AVACS pump head, replacing the valve head is unfortunately not possible. If the pump head is so worn that inflation is no longer possible, the pump will need to be replaced.
For floor pumps with an AVACS pump head, you can replace the valve head with the MV EASY Multi Valve head or the CLIK TEC pump head for the Schwalbe Clik Valve. This allows the pump to continue being used.