AN3 PTFE hose with a stainless steel braid, sold per foot so you can buy exactly the run you need. AN3 is the smallest common size and is used where line stiffness matters more than flow: brake and clutch hydraulics, oil pressure gauge and sender feeds, and boost or vacuum reference lines. The PTFE liner is chemically inert against brake fluid, oil and alcohol-blended fuel, and unlike rubber it will not swell or absorb moisture over time. The stainless braid prevents the hose ballooning under pressure, which is what keeps pedal feel firm and gauge readings quick. Assemble with AN3 hose ends specified for PTFE hose.