1. Straight-through internal threaded pipe fittings: used for direct connection between pipes of the same diameter, with simple structure and easy installation.
2. Elbow internal threaded pipe fittings: used to change the direction of the pipe, common ones are 90-degree elbows and 45-degree elbows, which can be selected according to needs.
3. Three-way internal threaded pipe fittings: used for the intersection of three pipes, which can realize the branching and merging of pipes and is suitable for complex pipe systems.
