The low pressure tee is the pipe fitting, the connecting part of the pipe is a kind of three - way, which has no uniform type. For example, DN150*150*10045 bend, commonly known as: half bend, 135 degrees bend. Mainly used in the main pipeline to branch the branch. Middle and low pressure three - pass by material, making method, manufacturing standard into different kinds. Middle and low pressure tri-pass materials can be divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon and asphalt, PPC, etc. The production method can be divided into top system, pressing, forging, casting, etc. According to manufacturing standard, can be divided into national standard, electric standard, water standard, American standard, German standard, daily standard, Russian standard and so on.

Low pressure tri-pass use: similar to four-way, but the nominal size of the pipe has two kinds. The nominal diameter of the two large pipes is the same. Tube plug, plug, wire plug. It is mainly used to block the pipeline and prevent the leakage of medium in the pipeline. It can prevent the debris from entering the pipeline. It is usually used in conjunction with the external joint and the three-way pipe fitting. Tube cap commonly known as: cover, tube cover. Its purpose is to close the pipe, the function is the same as the pipe, but the tube cap can be directly in the pipe, do not need other pipe fitting.