http://www.aikencolon.com/krendl-kd-1-nozzle-filter.html - The Krendl KD1 is a drill and fill nozzle with a built-in ventilating and filter system. The KD1 will eliminate drilling multiple holes and/or feeding hoses down the wall. With one 2" hole 3/4 of the way up the wall simply insert the nozzle tight against the wall, when the material reaches the nozzle just rotate it 180 degrees to finish filling the wall, packing the insulation tighter than most dense packing methods in half the time.