A straight, reusable hose end designed specifically for PTFE-lined hose in AN4. It works by sliding the socket nut over the hose, seating an olive on the exposed PTFE liner, then drawing the nipple in as the nut is tightened, which compresses the olive to form the seal. AN4 PTFE is the go-to for turbo oil feeds, brake and clutch lines, gauge plumbing and E85 fuel where rubber would swell. The straight body suits runs with room for a gentle bend approaching the fitting. Fit only PTFE hose of the matching size, never rubber or push-on hose, and make sure no braid strands are trapped under the olive or it will weep.