Replacement Impeller For All Kestrel ModelsPart #: 0801Replacement Impeller specifically made for all Kestrel Models. User replaceable.Impeller Replacement Instructions:Using your thumbs, press FIRMLY on the impeller module to remove the entire unitPress only the sides of the new impeller when installing to avoid damaging the precision hub bearingInsert the impeller so that the half that has the serial number label on it goes in first and faces the back of the unit once in place. Orient one "arm" straight up (The impeller should look like a peace symbol or an upside-down Y)Wind NONEBarometric Pressure NONE