A coupling for a conduit.

摘要

The invention relates to a coupling (1) for a conduit of the kind having an internal surface with convolutions extending axially of the conduit, comprising a first part (2) with external surface convolutions (3) complementary to those of a conduit to which the coupling (1) is to be connected and a second part (4) defining with the first part (2) a tapered gap (7) whereby when the coupling and conduit (1) are connected together by relative rotation, the respective complementary convolutions engage and draw the coupling and conduit together so that a seal is formed between the end of the conduit and the first and second parts (2), (3) of the coupling.