These are an excellent alternative to rubber bungs for sealing up larger containers. These large corks come in various sizes and the choice of bored or solid.
The bored corks are designed to fit the 3 piece and S Shaped airlock.
Keep in mind, since this is cork there will be slight amounts of air transfer through the cork. If keeping a tight seal is important (like for beer for example) we recommend using a rubber bung instead.