| 摘要 |
The key lock 20 may be depressed and locked to retain the formations 14 on the pivoted members 16 in pipe groove 12 and the cap seal 30 engaging the pipe end. A second groove 36, an inward shoulder (46, Figs. 3 and 4 or a circlip (52, Figs. 5 to 8) may temporarily retain the cap 18 in a partially removed condition, permitting gas escape past the seal 30, when engaged by the formations 14 or other formations (40, Fig. 2) on the members 16. <IMAGE> |
