Replace the feet on your Rena Air series pumps if you notice wear or if you lose the foot. The feet on Rena air pumps stabilizes the pump and reduces noise and vibration. Fits all versions of the Rena Air 100 / 200 / 300 / 702B / 702C / 702D. Also if you have older discontinued model Rena pumps such as models 101, Alize or Pixie. These feet are exact replacements.