These covers are constructed of heavy-duty vinyl. They provide a weatherproof seal and a superior grip.Use them with male plugs (dockside end of your shore power cordset or pigtail adapter) for a superior seal. Sometimes this cover is described as a "new" (the N in the part number), or as a "short" cover.

Fits:
20A plug 205CRPN
30A plug 305CRPN