A double-tapped bushing is more compact than a reducer, although not as flexible. When a double-tapped bushing features a smaller feminine thread concentric to a larger male thread (and so couples a lesser male close to a bigger female), a reducer can have substantial and little ends of either gender. http://valvesandfittings29483.xzblogs.com/18126491/not-known-factual-statements-about-valves-and-fittings