tam·pi·on /ˈtæmpiən, ˈtɑm-/
  木塞子,炮栓,風琴管上端的塞子
  Tam·pi·on n.  [Written also tampeon, and tompion.]
  1. A wooden stopper, or plug, as for a cannon or other piece of ordnance, when not in use.
  2. Mus. A plug for upper end of an organ pipe.
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  tampion
       n : plug for the muzzle of a gun to keep out dust and moisture