How much bigger should a plug be than the hole it fills?

When determining the appropriate size of a plug in relation to the hole it is meant to fill, the plug should be larger than the hole to ensure a proper fit and effective sealing. In this case, a plug that is 2 inches larger than the hole it fills is optimal because it allows for the necessary compression and adaptation to ensure a snug fit. This size difference helps in accommodating variations in the hole's dimensions and material properties, which can affect how well the plug seals against potential leaks or gaps. This also prevents issues arising from improper sizing, such as the plug failing to stay securely in place or not effectively closing off the intended space. The selection of a 2-inch difference strikes a balance between being sufficiently larger for a reliable seal and avoiding being overly cumbersome, which can complicate installation or removal.