End seal hydraulic fittings Improvement

End seal hydraulic fittings improved end seal Hydraulic pipe fittings  , welded end straight couplings . End sealed with two flat washers a gripping combination to achieve. Such sealing of the following deficiencies : 1. Rotary joint body bind human body fine thread , due process in the tail for a reason undercut . So the inner diameter substantially equal to the diameter of the thread is not easy to achieve a combination washer correct positioning ( alignment ) , the installation pad because easily damaged. 2 . The sealing properties of such end seal