Service Box WV1 for the Karcher SG1 and SG2 Gum Remover will give you roughly around 8 9 hours of runtime.
The Karcher WV1 Includes(2) GP03 butane propane mix gas cartridges(4) Gum remover solution(2) Black brushes, stainless steel(1) Green brush, carpet and material
1 service box each