机械三/四通安装说明，出水口（滚槽类型和螺纹）Installation Instruction for Mechanical Tees/Crosses, Side Outlets(Rolled type and Threaded type), including XGQT3, XGQT3S,XGQT3U.
（四）通分丝接式和沟槽式两种。丝接式机械三（四）通，在进行螺纹连接 时，应先将有效外螺纹部位涂抹白厚漆，然后缠绕麻丝，确保螺纹连接的密封 性能。
Side outlet (mechanical cross) can be directly used to connect the branch pipes with the main steel pipe. Firstly, to open the hole with hole-cutting machine on steel pipes ,and clip the side outlet(mechanical cross)into the hole, around which are sealed by the gasket rings .Side outlet (mechanical cross)are categorized as threaded style and Grooved style. When be connected ,the threaded mechanical tee or mechanical cross should be applied with some compacting paint on it′s outer screw thread ,and then roll thread around it to ensure the sealing performance of threaded joint.