Atos Medical Inc Standardmm LaryTube 12/55 Size 13-1/2mm I.D. x 17mm O.D., 55mm L Provox LaryTube is a very popular, soft laryngectomy tube. A key feature that distinguishes the Provox LaryTube from traditional laryngectomy tubes is that it can hold a Provox HME cassette and/or Provox FreeHands HME. It is available in three versions and can be used with or without a voice prosthesis.