Hydro X Series, 90° Rotary Adapter, Twin Pack (G1/4" BSPP Port Threads, Solid Brass Durability, Securely Sealed Rotation Mechanism, High-Quality Polished Finish) Chrome

I use it without any problem, I like the fact that have a double rubber ring to prevent water leakage!

They connect the fitting to the tube. They are a little pricy and are not really worth if you can bend them otherwise they do help

All hydro x fittings in my loop are corroding. It is just affecting these. Everyone online is telling my this is an issue with coursair fittings.

These work great for getting a 90 Degree turn in a tight spot since they don't stick out very far. Unfortunately that makes them kinda hard to use the rotary collar to tighten them without turning the opening or vice versa. Still highly functional if not a bit expensive with 0 leaks at the O-ring or the rotary and they look nice for a build that matches their color (i used chrome and they are very shiny and pretty. It does look sorta ugly when you have use these directly linked to a Corsair compression fitting or hardline fitting since those are wider at the male end than the female of these 90s, but that's kinda nitpicky.