i removed the bezle nuts from the auto trans colling lines the ones that hold the female fitting int the radiator this was a long time ago. i now put them back on folowwing the metal washer that gois betwwen radiator and nut. they now leak severley under pressure wer there any sealing gaskets that are soposed to be there

 

You should always use new aluminium or copper crush washers inbetween the tank and the threaded fitting, as well as to counterhold the fitting once properly installed. Be gentle.