Replacing your GAMMA2® Vittles Vault™ Lid Gasket (commonly referred to as an o-ring or seal) is an essential part of keeping your dog's food fresh. Without our patented sealing system, which creates an airtight seal, GAMMA2 lids and Vaults are not as functional. Available in two sizes: 2.0 or 5.0. One replacement gasket per package. PRODUC