Take control of your Mercury maintenance with this genuine VALVE ASSEMBLY (Use With Oil Reservoir). Straightforward replacement that delivers factory results without shop labor costs.

Built with Mercury Marine’s precision engineering, this component ensures reliable operation across all engine RPM ranges. Part number 18920A1 is manufactured to exact Mercury Marine factory specifications for precision installation and optimal performance. Constructed from premium marine-grade materials designed to withstand harsh saltwater and freshwater environments.

Factory parts exist for a reason — they work. Part 18920A1 undergoes rigorous Mercury Marine quality testing that aftermarket manufacturers skip. The result? Reliable performance season after season.

Compatible Mercury Marine Engines

FITS:

• Compatible with Mercury Marine engines
• OEM genuine Mercury part

COMPLETE SERIAL NUMBER COMPATIBILITY:

HP Models

• HP OUTBOARD (Mercruiser): 0D469859-0F679999, 0F680000-0K999999, 0B664190-0F729999, 0F730000-0M100000, 0M100001-0W249999, 0B664190-0F729999, 0F730000-0M100000, 0M100001-0W249999, 0B664190-0F729999, 0F730000-0M100000, 0M100001-0W249999, 0M100001-0W249999, 0M100001-0W249999, 0M100001-0W249999, 0L914990-0W239999

Need help finding your serial number? Check our serial number location guide for step-by-step instructions on locating it on your Mercury engine.

Verification & Support

Questions about part 18920A1? Use our parts finder tool to verify fitment yourself. Prefer to talk to an expert? Use the contact buttons at the bottom of this page to reach our team by text, call, or email

Four decades of marine parts experience. Best prices guaranteed – free shipping on orders over $100.