| 摘要 |
Each of a flange and an end cap have at least two magnets or magnetic pieces arranged in complementary fashion to removably attached the end cap to the flange. The end cap removable seals an orifice of the flange by magnetic attraction between the at least two magnets or magnetic pieces of the end cap and the at least two magnets or magnetic pieces of the flange. The seal between the end cap and flange provides for pressure relief as the force of a pressure within the orifice exceeds the force of magnetic attraction between the at least two magnets or magnetic pieces of the end cap and the at least two magnets or magnetic pieces of the flange.
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