Motor Flush Ear Muff Outboard motor flushers quickly flush away salt, sand, minerals and contaminates from your lower unit cooling system extending the engine’s service life. Easy to use molded PVC cups deliver fresh water to flush the cooling system through side intakes on the lower unit. Simple garden hose connection, no tools required. Great for winterizing, tune-ups and other maintenance that requires running an outboard engine out of the water.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.