Soldato
I hear you. the failed fitting went back to EK who confirmed it was knackered and replaced it.
The seal on the threaded rotating bit (which you cannot handle/see) on the right.
Mine was the same all be it an EK 90 degree elbow. Leaked out of the rotary o-ring. New fitting and was fine although by that time I'd already made my mind up about getting rid of it all.
Don't know how my top card survived as it leaked straight onto the SLI fingers and filled the SLI bridge before I spotted it.