| 摘要 |
Piping characterised in that it consists of a roll (1) made from extrudable plastic and of a single lip (2) also made from extrudable plastic but of lower hardness, the said lip (2) being positioned at the periphery of the roll parallel to the longitudinal axis of the latter, while being offset towards the bottom with respect to the transverse axis (3) of the roll. <IMAGE>
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