| 摘要 |
A cast-in-place coupling (6) is positioned on concrete forms (2) by detachable attachment means (7, 10). The coupling (6) may have breakaway tabs (7) or may be frictionally engaged to a fitting (10) fastened to a form (2). After concrete is poured the attachment means (7, 10) is separated from the coupling (6) with minimum effort and inconvenience. The coupling (6) itself contains an intumescent which causes the coupling (6) to convert to a firestop under file conditions.
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