| 摘要 |
A device for preventing the introduction of a first conduit into a second conduit includes an insert (3) to be mounted to the second conduit (1). The insert (3) includes a blocking portion (6) sized to block entry of the first conduit (2) into the second conduit (1). The insert (3) is mounted to the second conduit (1) so as not to interfere with flow of a substance from a third conduit (4) into the second conduit (1). The insert (3) may be retractable and biased towards a position where the blocking portion (6) extends from the second conduit (1). A substance deflector (12) may be provided to impede flow of a substance from the first conduit (2) into the second conduit (1). The insert (3) may have many applications, but is particularly suited to use in the fuel inlet port of the neck of a diesel fuel tank to prevent unintended introduction of unleaded petrol.
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