Pipe Couplings (Aluminium Alloy) Union Adaptor/Unified 3/16" to 1", 3/16" to 1/2", 5/8 to 1", 11/4" to 2", for use with Parallel Gaskets (e.g. Bonded Seals)
Data Sheet by SAE ITC TSC Aerospace Standards (Formerly ADS Group Limited), 07/01/1975