For extra-fresh mixing under vacuum and short-term storage. With a practical vacuum valve that also serves as a vacuum indicator. Suitable for use with ZWILLING Enfinigy high-performance blender Pro 53001-001-0CH & 53001-000-0CH, high-performance blender 53000-001-0CH & 53000-000-0CH and universal blender 53002-001-0CH & 53002-000-0CH. Vacuum pump required - available separately: Z36801-000-0