Gas capsule and gas delivery system

摘要

A gas capsule (4) for storing a fluid for example helium under pressure comprises a hollow body from which extends a hollow neck (12). A stopper (5) engages with the neck in a fluid tight manner. The stopper (5) includes a main hollow portion (13) and a stem (10) extending outwardly from the main hollow portion. The root (14) of the stem (10) where it joins the main hollow portion (13) forms a frangible section which when broken will allow fluid in the capsule to escape under pressure.