An explosion-proof conduit fitting configured to be placed between two pieces of electrical conduit, thereby connecting the two conduit pieces together such that electrical lines running through the two conduits also pass through the fitting. An embodiment utilizes two primary components to prevent migrations of gases and to provide the structural requirement of withstanding the extreme pressures of explosions from allowing flames and temperatures above the ignition temperature of flammable gases to pass through the hazardous area boundary: a granular fill, such as sand; and a removable gas-tight fire-stopping compound, such as an expanding closed cell foam.