1. Pipe fittings used for connecting pipes include: flanges, unions, clamps, band clamps, sleeve couplings, and collar gaskets, etc.

2. Fittings for changing pipe direction: Elbows, bends

3. Pipe fittings for changing pipe diameters: Reducing (Reduced) Tee, Reducing Elbow, Branch Tee, Reinforcing Pipe

4. Increase pipeline branch fittings: tees, wyes

5. Pipeline sealing fittings: gaskets, plumber's tape, sisal rope, flange blank, pipe plug, blind flange, cap, and welding plug

6. Pipeline Fixing Fittings: Clamp rings, tow hooks, lifting rings, brackets, supports, pipe clamps, etc.