Aftermarket Mercruiser 32-54236 Alpha 1 Gen 1 Water Tube
The Sierra 18-3221 Water Tube replaces Mercruiser 32-814384, Mercruiser 32-860220, Mercruiser 32-8M0171252 for Mercruiser applications. It carries cooling water between the drive/pump and the engine cooling circuit.
Alpha one gen 2

Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3221?
Sierra 18-3221 is an aftermarket water tube for Mercruiser applications.
Which part numbers cross-reference Sierra 18-3221?
This listing cross-references Mercruiser 32-860220, Mercruiser 32-814384 and Mercruiser 32-8M0171252. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3221 fits my Mercruiser application?
Contact us with your engine model and serial number and we'll help check suitability.