Solid iron piping was customarily built with one spigot end(simple) and one socket or hub close(cup shaped). In use, the spigot of 1 section was positioned into the socket with the previous 1 and a ring of oakum was forced down to the joint which has a caulking iron. Soon http://toggle-valve95269.dbblog.net/18471235/valves-and-fittings-no-further-a-mystery