For the systems listed above, are joined by threaded attachment system. While this is a system that responds to a specific pipe, its use should not be ruled, for those cases in which, pipes should be used to 6 inches in diameter and features working, require high chemical and mechanical resistance, quick and efficient installation.

If the entry of the tube petrolero Petrofibra 2000, built with vinyl ester epoxy resin and glass fiber reinforcements (E.R.F.V.), This tube, responds in an all out Norma A.P.I. 15 LR, the connection system M-H API threaded.