九九欧美I国产精品亚洲成人Iwww.av免费观看I91精品成人久久I中文av网站I国产精品免费高清I国产淫aI天天av资源

1. The unique screw type column head design can be directly installed by hand, which is convenient for operation and disassembly;

2. Integrated column head, zero dead volume design;

3. The column pipe can be extended seamlessly through the connector to facilitate the installation of the column;

4. All pipelines are international standard parts, common to all kinds of equipment;

5. Withstand voltage 5bar;