Take control of your Mercury maintenance with this genuine THERMOSTAT COVER USE WITH 90 DEGREE ELBOW COMPONENT OF POWERHEAD [823291A94] OR [809794A97] OR [809793A97]. Straightforward replacement that delivers factory results without shop labor costs.

Engineered to Mercury’s rigorous OEM standards, this thermostat ensures reliable operation across all engine RPM ranges. Part number 19801A1 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.

Smart boat owners know: buying cheap parts twice costs more than buying genuine Mercury once. Part 19801A1 delivers long-term value through superior materials and precision manufacturing.

Compatible Mercury Marine Engines

FITS: 225-300HP MARINER, MERCURY, RACE OUTBOARD (MARATHON)

• Fits MARINER, MERCURY, RACE OUTBOARD 225-300HP engines
• Compatible HP: 225HP, 250HP, 300HP
• Model types: MARATHON
• Covers 19 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

225HP Models

• 225HP MARATHON (Mariner): 0G245605-0G760299, 0G760300-0T408999
• 225HP OUTBOARD (Mariner): 0D280813-0G760299, 0G760300-0T408999, 0G129222-0G760299, 0G760300-0T408999
• 225HP OUTBOARD (Mercury): 0D280813-0G760299, 0G760300-0T408999, 0G129222-0G760299, 0G760300-0T408999
• 225HP SEAPRO (Mercury): 0G245605-0G760299, 0G760300-0T408999

250HP Models

• 250HP OUTBOARD (Mariner): 0G129222-0G760299, 0G760300-0T408999
• 250HP OUTBOARD (Mercury): 0G129222-0G760299, 0G760300-0T408999, 0G980600-0T800999

300HP Models

• 300HP OUTBOARD (Race Outboard): 0G610221-0T105297, 0G610221-0T105297

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

Want to verify compatibility for part 19801A1? Use our parts finder tool for instant confirmation. Still have questions? No problem – use the contact buttons at the bottom of this page to reach us by text, call, or email

Serving boaters for over 40 years. Low prices, fast shipping – most orders placed by 1pm ship today.