AS8590-4 -- AS8590 PIPE COUPLINGS (STEEL) UNION ADAPTOR/UNIFIED ATTACHMENT END, 3/16" TO 1/2" FOR USE WITH PARALLEL GASKETS (EG BONDED SEALS)
SAE InternationalAS8590 Pipe Couplings (Steel) Union Adaptor/Unified Attachment End, 3/16" to 1/2" for Use with Parallel Gaskets (eg Bonded Seals)AS8590-4