Copy lane end connection issue
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Are there only threads at both ends of the coupling? Can’t the ends be of a socket-type design? If both ends of the copy pipe can be socket-type, what is the difference from a double-socket pipe clamp?
This is the first time I’ve seen this Chinese term. If followed by this naming convention, a copy of a coupling can only be a threaded coupling ； Double socket pipe couplings can only be of the plug-weld type coupling.