导油管 meaning in English

oil conduit

Lqry series hot oil pump is supported by the ball bearings at the both ends , front end lubricated by lubricating oil , while back end lubricated by grease , with an oil conduit in the middle used to observe the conditions of sealing and recovery of heat conduction oil
Lqry系列热油泵的支撑采用了双端球轴承支撑的结构形式，前端采用润滑油润滑，后端采用润滑脂润滑，中间有一导油管，用以随时观察密封情况和回收导热油。