The Schwalbe ClikValve system consists of 2 components. One is the Clik valve, which either replaces the (removable) Sclaverand valve core in the tube or is screwed into the existing DV. A different Schwalbe ClikValve is required for both SV and DV. The counterpart is the appropriate ClikValve pump head or pump head adapter. To retrofit the pump head, you can choose between two options. Either you replace the pump head of your existing pump with the Schwalbe Click Valve pump head, or you use the Schwalbe Click Valve adapter. This simply screws into or clamps onto the existing pump head. This works with most commercially available pumps, including hand pumps. The Schwalbe Sclaverand ClikValve conversion kits are available in several variants, all of which are included in the starter set. **Contents:** - 7x SV-SCV Conversion Kit (2 valves) - 3x SV-SCV Conversion Kit (2 valves with pump head) - 7x SV-SCV Conversion Kit (2 valves with pump head adapter) - 3x DV-SCV Conversion Kit (2 valves) - 2x DV-SCV Conversion Kit (2 valves with pump head) - 3x DV-SCV Conversion Kit (2 valves with pump head adapter)