| 摘要 |
A pipe fitting in the form of a male coupler and a female coupler both of which have imbedded therein a threaded metallic insert. Both the male coupler and female coupler have a metallic insert that is constructed to define a treacherous path at the surface boundary of the metal insert so as to minimize the possibility of any leakage exteriorly of the coupler from a liquid conducting bore passing through each of the couplers.
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