围绕套管的四周360度的环型空间允许水泥完全能够密封套管与井壁。
A continuous 360-degree annular space around casing allows cement to completely seal the casing to the borehole wall.
套管头四通包括固定和密封套管柱上端的部件，并经常提供一个用于与环形空间连通的开口。
The casing bowl incorporates features to secure and seal the upper end of the casing string and frequently provides a port to enable communication with the annulus.
这些危险场所电缆密封套管和插头由高性能的尼龙材料制造而成，且颜色有蓝色和黑色两种可选。
These hazardous location cable glands and strain relief fittings are made of high performance nylon and can be ordered in either blue or black colors.
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