What materials are used in compound rubber grips?
There is one thing that all these guys left out. Somewhere along the line the pipe has to be opened or vented so that pressure does not build up inside the pipe and force the solder out. For example if i have two capped off pieces of pipe and solder them together the solder will not take. Or maybe there is still water in the line making pressure build up inside the pipe and preventing it from venting out another end of the pipe.
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