| 摘要 |
<p>The core has an outer sealing portion (31) formed integrally on a cylindrical sealing unit (30). The portion is fitted with outer periphery of a core body for being held between a body and an inner wall of a throughbore (52) to adhere closely to the outer periphery of the core body. An inner sealing portion (34) is formed integrally on the sealing unit for adhering closely to an outer face of a plug (24).</p> |
