| 摘要 |
In a plastic pipe fire-protection collar (1), consisting of an open-ended tubular housing (2) fitted with an insulating lining body (17), centring of pipes of different outside diameters is achieved by fitting, in each end of the housing (2), a radial insert (11) which has an inner opening (22) of smaller size than the housing opening (21). Preferably, the insert has radial slits at its inner edge (11b) to form tongues which can be folded
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