国产人成午夜_久久夜色精品国产噜噜亚洲a∨_99伊人專業從事互動視頻_在线日韩模特私拍在线_国产精品无码一区二区三区在老妇_日韩欧美日韩激情_玉女福利视频导航_欧洲美女粗暴牲交bd_中文字幕大香线中文字幕_亚洲黄色av天堂

>> steel pipe series parameters and supporting manual      >> PE pipe series parameters and supporting manual

When transports the pipeline carries on the trap work, this equipment uses in connecting the pipeline with to clamp the plate valve; waited the trap construction to finish, uses in the pipeline stopping up the hole; in convenient detector tube situations and so on medium, wax level. Is advantageous for tubes and so on elimination pipeline cleaner to clean up, the overhaul, check-out facility’s breakdown. According to different caliber configuration corresponding specification by-pass.