| 摘要 |
An inspection or like port for ducting comprises an annular flang element (1) having a radial slot (4) at one point around its outer circumference and a sleeve (2) extending centrally from one side of the flange element (1) and having access means (6) at its outer end for installation or access of fittings for use with the port, a sealing ring (7) being positioned around the sleeve (2) adjacent to the flange element (1) and being retained in a specific position on the sleeve (2) by retaining means (9). <IMAGE>
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