If you use your FoodSaver vacuum sealing system regularly, it's important to keep the gaskets in good working order. Depending on how often you use your FoodSaver and what types of foods you seal, you may need to replace the gaskets every few months or so.
If you notice that your gaskets are starting to wear out or become less effective, it's time to replace them. You can buy replacement gaskets from the FoodSaver website or from many retail locations that sell FoodSaver products.