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。
Use a section of 4 PVC waste pipe with a threaded screw-cap fitting on one end and a standard end-cap at the other.
使用线程旋盖拟合一端和标准年底，4聚氯乙烯排水管节在其他上限。
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