1. Welded Tee: A tee pipe fitting that is welded to the connecting pipe components.

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

3. Clamp-type Tee: A tee fitting where each end features a clamp connection, allowing the fitting to be inserted into the pipe and then securely fastened.

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