1. Welded Tee: A tee pipe fitting that is焊接 after mating with the connecting pipe.

2. Socket Tee: A type of tee fitting where the connecting pipe is inserted into the ends of the tee and then welded or fused.

3. Clamp-style Tee: A tee pipe fitting with clamp-type connections at each end, where the pipe is inserted and then secured.

4. Threaded Tee: A tee pipe fitting connected by threads.