| 摘要 |
The tubes (2) have particularly a flat oval cross-section with a large diameter (A) and a small diameter. The widened tube ends (1) have an oval cross-section, the large diameter (C) of which is equal in size to the diameter which is large and the smaller diameter of which is greater than the small diameter. The ratio of the diameters of the tube ends (1) is greater than 2:1, particularly 2.3:1. Breakthroughs in the tube base (3) are formed as through passages and between the through passages and the tube ends are elastic sealing plastic or rubber inserts (6) with collars (7), involving an elastic hardening sealing paste, e.g. silicon paste or similar.
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