The second from the right in the image above looks like a Dunhill Inner Tube. This aluminum tube was designed to connect to the pipe's stem at one end. The other slid snugly inside of the pipe's draft hole, the angled part fitting flush and aligning with the contour of the inside
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of the bowl. Its purpose was to keep the briar surrounding the draft hole from becoming soaked with tars from the tobacco, thereby keeping the pipe fresh. When the tube became internally soiled it could be easily removed and cleaned, or simply replaced.