Bridgeport’s SG-67 2-1/2" to 3" Cellulose Conduit Body Gasket is used to create a dust-tight seal between a conduit body and its cover. These gaskets are made from vellumoid, an impregnated cork-cellulose fiber which is serviceable up to 250°F. To install, simply place the gasket between the conduit body and cover. Then, secure the cover in place to create a dust-tight seal and protect the inner wiring. Cellulose conduit body gaskets are available in trade sizes 1/2" through 4".