若是冷却器垂直安装，起吊孔在端盖上。

If the cooler fixs vertically, the ring hole on the cover.

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布放后应保留适当长度于引进端人（手）孔或拉箱内。

Keep proper length of pipe when put into the manhole .

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比较端孔导管与侧孔导管。

Comparison of end hole catheters with side hole catheters.

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比较端孔导管与侧孔导管。

Comparison of end hole catheters with side hole catheters.

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