| 摘要 |
There is provided a vessel (10) comprising a plastics container (12) with an upstanding neck (13) around which is located a collar (14), to which is attached a release mechanism (16) for dispensing substances from the container. The collar (14) may comprise a plurality of spaced barbs (32) which engage with a neck (13) of the container to prevent removal of the collar (14) through barbs engaging the neck at a number of positions. The collar (14) has two threaded portions (30,32) respectively engaging with the release mechanism (16) and the neck (13), and an o-ring (40) sealing the plastics container (12) to the metal collar (14). The container may be capable of comprising pressurised substances for example, fire extinguishers, hot water cylinders, air brake accumulators and gas containers containing butane, propane, oxygen and/or hydrogen. |
