Compression fittings (occasionally known as "lock-bush fittings") include a tapered, concave conical seat; a hollow, barrel-shaped compression ring (sometimes identified as a ferrule); and a compression nut which is threaded onto your body in the fitting and tightened for making a leakproof relationship. They are usually fabricated from brass or http://rylanwhqxe.mybloglicious.com/11156754/rumored-buzz-on-valves-and-fittings