| 摘要 |
The retainer portion of the mouthpiece of an underwater breathing apparatus includes at least a portion made of a thermoplastic material. The retainer is customized to the bite of the user by heating the mouthpiece to render the retainer plastic. The retainer, while plastic, is gripped by the teeth of the user to form an impression of the user's bite in the thermoplastic material of the retainer. In one embodiment, the thermoplastic portion of the retainer comprises only a sleeve of thermoplastic material which is affixed over the conventional rubber retaining member. In an alternative embodiment, the thermoplastic retainer is formed as an integral molded portion of the mouthpiece.
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