... standard, 4. Size:1/2"-40" 5. Type:Slip on flanges,Plate flanges, Blind flanges, Spectacle ... Sealing surface : FF ,RF, LJ, FM ,R.T.J ,R.J ,MALE ,FEMALE and so on . 8. Used for : ... :3.1B 12. Certificate :TUV 13. ISO certificate : ISO 9001:2000 and ISO 9001 :2008 14. Special equipment manufature license : manufacture ... the P.R.C. 15. Marking :according to client's requirement. 16. QC staff :10-15 . 17. ...