A metal drive-in plug is difficult to remove when installed. The 84-848 is a cap for the open ends of size 8 uprights and covers the top of a 10-848 tee fitting. Kee Klamp Types 77-7, 77-8, 84-7, or 84-8 could also be used, but do only cap the tube, not the tube, as well as the component. This fitting can only be used with EN 10255 Medium Tube.