| 摘要 |
The device disclosed includes a conduit piece adapted to be connected into a pipeline and having an aperture in the sidewall for a branch connection, and a circumferentially unbroken and apertured sleeve surrounding the apertured portion of the circuit piece, with circumferentially unbroken packing rings between the sleeve and conduit piece at opposite sides of the apertures, providing for pressure equalization inside and outside of the conduit piece in the region of the connection.
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