6.2.1.3.6.4.2 Closed cryogenic receptacles may, in addition, have a frangible disc in parallel with the spring loaded device(s) in order to meet the requirements of 6.2.1.3.6.5.
6.2.1.3.6.4.2 封闭式低温贮器还可在弹簧式装置之外安装一个易碎盘，以满足6.2.1.3.6.5.的要求。