These tubes are used on variable capacity tanks with floating lids. The seals are inflated with a hand pump, and deflated to lower the lid. In this way air can be excluded from the tank, protecting your olive oil from oxidisation.
If a tube is over-inflated, punctured or become weak with age and split or broken, a replacement can be provided.
Primarily, the seals we supply are intended for Sansone brand tanks, we have found that these seals are compatible with most other tank brands, however the diameters may vary between different brand tanks of the same size.