AN6 PTFE hose with a stainless steel braid, listed here as the longer-run option for full circuits rather than short jumpers. AN6 is the everyday performance size, covering EFI fuel feed and return, power steering and smaller oil cooler and turbo lines. The PTFE liner is the reason to choose it over rubber: it does not permeate fuel vapour, so engine bays stay free of petrol smell, and it is unaffected by ethanol and methanol blends that harden ordinary hose over a few seasons. The stainless braid resists abrasion and stops the hose expanding under pressure. Fit only PTFE-specific AN6 hose ends, as rubber-hose ends will not seal on this liner.