The dreaded quick release fitting question

[K3RSS]

Hello all, I am going to be replacing all the transmission cooling lines in my 2001 XLT, 5.4 L, w/4R100 transmission with auxiliary cooler. The picture below shows the type of quick release fitting I have. (Sorry for the blur.) The lines are 3/8" OD. Does anyone know what tool I need to work the fittings? Have you used the tool you recommend?

 

[bmrisko]

I believe the hex "nut" just unscrews as it is a type of compression fitting. Someone please correct me if I'm wrong. Been a while since I did my cooler swap.

 

[K3RSS]

Thanks, bmrisko, for the help. These are quick release fittings and I used the 3/8" tool from an OTC 6593 set to get one line off. I'm still working on getting the second line off. Old age is making the fitting cranky.