密封器 meaning in English

packing maker
sealer

Servo - aligning sealer for polished rod at wellhead
抽油井口随动对中光杆密封器
Field application of qbzc - 25 28 polish rod sealer
28光杆密封器的现场应用效果评价
Specification for water trap for diesel exhaust
内燃机排气用水密封器规范
Application of new type polished rod sealor
新型光杆密封器的应用
Development and application of centralizing polished rod stuffing box
随动对中光杆密封器的研制与应用

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