The Holte Air Inlet is made of a low carbon alloy steel and carburized to file hard prox 62 Rockwell. This gives the rotating seal surface a long lasting, smooth, hard surface. One ring nut on each end provides even pressure to the packing. A lantern ring in the center of each packing distributes lubricant evenly. The Holte Air Inlet will adapt to all drill rigs and drill pipe and is most commonly used to introduce air into a dual wall pipe chamber for reverse circulation foundation and well drilling.