These are a must in my opinion! I just installed these on my fuel rails. The nut will not allow the adapter to pop off like the clip style. I also used a drop of blue Loctite on the adapter nut. I read several threads where guys were having problems with the old style blowing off at the fuel filter and fuel rail. I also used Parker Push-Loc high pressure hose with -6 AN/JIC fittings. The guys at the hydraulic shop said I did not need hose clamps with the Push-Loc hose but I purchased EFI hose clamps and thought it would be added security.
