機械三/四通安裝說明，出水口（滾槽類型和螺紋）Installation Instruction for Mechanical Tees/Crosses, Side Outlets(Rolled type and Threaded type), including XGQT3, XGQT3S,XGQT3U.
（四）通分絲接式和溝槽式兩種。絲接式機械三（四）通，在進行螺紋連接 時，應先將有效外螺紋部位涂抹白厚漆，然后纏繞麻絲，確保螺紋連接的密封 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.