Gaskets

Gaskets provide a durable, flexible seal at the joints between assemblies such as where an exterior wall meets a floor or at a penetration in the assembly. For example, where a water line or electrical conduit enters or exits, gaskets prevent air and moisture from moving through the joint or penetration.

Gaskets may be rubber, plastic, or one of many combinations of materials.  Some are self-sealing, but others require mechanical connection.