When the inlet diameter is greater than pump inlet should be installed eccentric adjustable tube.
当进水管直径大于水泵进水口时，应安装偏心变径管。
Pump inlet pipe diameter changes when level, should choose eccentric different-diameter pipe.
泵的水平入口管变径时，应选用偏心异径管。
Water Ring Vacuum pump cylindrical shell to install a pump eccentric impeller-shaped teeth.
水环式真空泵的圆柱形泵壳内安装一个偏心的牙状叶轮。
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