| 摘要 |
An externally threaded nipple (24) fits through a circular opening (38) in a flexible wall (14). The nipple (24) is carried by a first ring member (18). An internally threaded second ring member (20) is screwed onto the nipple (24). The first and second ring member (18, 20) become connected together and the portion of the flexible wall (14) that immediately surrounds the opening (38) is trapped by and between two inner side surfaces (30, 36) of the two ring members (18, 20). Projecting portions (50) on one of the inner side surfaces are urged against the wall (14) to inhibit rotation of the attachment (16). One of the ring members (18, 20) has louvered fins (42) interconnected by strengthening ribs (44).
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