A threaded neck ring is secured to the tapered end of the cylinder to allow a protective cylinder cap to be installed.
车有螺纹的颈环固定在钢瓶的锥形端，可以安装保护性瓶帽。
A threaded neck ring is attached to the tapered end so that a protective cylinder cap can be installed.
锥状顶端装有带螺纹的颈环，可以安装保护性的钢瓶帽。
A threaded neck ring is attached to the tapered end so that a protective cylinder cap can be installed.
锥状顶端装有带螺纹的颈环，可以安装保护性的钢瓶帽。
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