| 摘要 |
A lip coupling for connecting together two pieces of pipe above a hole in the floor, the coupling having a semi-spherical upper portion connecting with a lower cylindrical portion, the semi-spherical upper portion having an outer diameter exceeding the outer diameter of the lower cylindrical portion, the lower portion of the semi-spherical portion being provided with a generally transverse lip which is adapted to rest against the floor surrounding the hole, the lip having an underside which is provided with a curved and upwardly directed recess to prevent any unnecessary contact between the lip and any irregularity on the surface surrounding the hole.
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