摘要 |
<p>The unit (1) consists of a main body (2) and transverse tubular connectors (6) which are external to the main body. These connectors are joined to the main body (2) via openings (2a). There are furnished parallel radial ribs (7), on the external face of these connectors, so spaced that on fitting a connecting tube, they enable a sealing ring to clamp the two together.</p> |