Unions might be threaded stop or socket weld finishes. There are 3 pieces within a union, a nut, a feminine conclusion, along with a male conclude. When the feminine and male ends are joined, the nuts provide the required strain to seal the joint. The swage is like reducers but http://eduardoophui.articlesblogger.com/10917040/the-greatest-guide-to-valves-and-fittings