In the PP ventilation piping system, the PP elbow is the pipe that changes the direction of the pipe:Bend molding,Injection
elbow,Socket elbow, etc. There are 45 DEG and 90 DEG to 180 DEG three most commonly used,In addition, according to the project
needs, including 60 degrees and other non normal angle elbow.Elbow and pipe connections are: direct welding (the most commonly
used way), flange connection, hot melt connection, electric melting connection, threaded connection and socket connection.
