Seal SWS and plug: Plug
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Plugs are used to close the unused cavities in a moisture proof housing.
A plug is in principle like a seal but without a hole in it for a cable.
Plugs are included in the repair kit p/n 9814235 for housings with cable terminals of the type 2.8 SWS.