A straight AN4 hose end from the 0209 reusable range, built as a two-piece socket and nipple that clamps braided hose without crimping. The swivelling AN4 nut is the key feature: you can seat the assembly and then rotate the nut onto the mating male flare without twisting the hose, which matters on the short, stiff AN4 runs used for oil pressure feeds, turbo oil supply and boost reference lines. Because it is reusable, the fitting can be stripped and refitted to a new length of hose. Cut the hose squarely and support the socket in soft vice jaws during assembly.