Appleton™ EYD 25% fill vertical conduit drain sealing fittings prevent the passage of gases, vapors or flames from one portion of a conduit system to another. They also restrict large amounts of ignitable gases or vapors from accumulating to confine explosive pressure. Appleton sealing fittings are explosionproof, dust-ignitionproof and raintight. They are suitable for use in Class I and II locations.