Pipe, particularly commercial pipe for supplying heat, has two notches at two positions, where notches run parallel from similar pipe ends or pipe starting to central axis of pipe
摘要
<p>The pipe has two notches at two positions. The notches run parallel from similar pipe ends or pipe starting to the central axis of the pipe. The length of the notches is variable. The pipes are connected by joining process, such as welding, soldering or clamping.</p>
