Standard Motor Products M13001 Engine Crankcase Breather Hose All TechSmart engine crankcase breather hoses are guaranteed to meet or exceed OE performance providing today's technician with the quality parts needed to get the job done right, the first time M13001 is a high-quality direct-fit replacement crankcase breather hose replaces cracked and leaking OE units to fix vacuum leaks and clear check engine lights associated with emissions system errors