Pipe Couplings (Steel), Union Adaptor/Unified Attachment End 3/16" to 1/2" & 5/8" to 1, for use with "O" Ring Gaskets in American (and 10050) or equivalent AGS3018 Tapped Bosses
Data Sheet by SAE ITC TSC Aerospace Standards (Formerly ADS Group Limited), 11/01/2000