These PN16 EN1092-1 Type13 Flange are developed for use in small diameter,high-pressure lines.They have a counterbore from the hub side slightly larger than the outside diameter of the pipe.AG can produce not only in GB Standard ,also the ANSI,ASME standard, DIN, BS, EN standard and GOST,JIS,SANS, standard.We will keep trying best to supply quality pipe fittings in standard or custom to our clients and partners.