国产激情在线-国产欧美自拍-成人黄色免费-亚洲天堂欧美-毛片哪里看-亚洲免费视频一区-久久久久国产精品视频-欧美做受喷浆在线观看-jlzzjlzz亚洲女人-欧美黄色大片在线观看-成人欧美在线观看-蜜桃av成人-亚洲黄在线-亚洲精品第二页-欧美日韩丝袜-一本色道久久综合亚洲精品-永久在线观看-91日韩在线视频-黄色av电影网址-欧美一区二区三区激情视频

Features:

1. Capable of holding top and bottom plugs simultaneously. Used for cementing with top and bottom plugs, or for continuous two-stage cementing.

2. Quick installation casing adapter at bottom is good for convenient fixing of cement head and casing head.

3. Two plug release indicator reveals visual indication of plug passing.

4. Large ID of plug container and balance pipe designing allows easy open of plug retain pins.