Keep your Mercury running like new with this genuine PROP NUT KIT. Built to the same exacting standards as your original equipment for worry-free boating.

Manufactured to strict Mercury Marine quality standards, this service kit ensures reliable operation across all engine RPM ranges. Part number 69578Q1 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.

Cut-rate alternatives might look similar, but they’re not engineered to Mercury’s exacting standards. Part 69578Q1 delivers consistent performance because it’s built right — the same way Mercury does it at the factory.

Compatible Mercury Marine Engines

FITS: 25-30HP MARINER, MERCURY (EFI)

• Fits MARINER, MERCURY 25-30HP engines
• Compatible HP: 25HP, 30HP
• Model types: EFI
• Covers 24 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

25HP Models

• 25HP OUTBOARD (Mariner): 0G760300-0T408999, 0P017000-0P153499
• 25HP OUTBOARD (Mercury): 0G760300-0T408999, 0P017000-0P153499

30HP Models

• 30HP EFI (Mariner): 0P153500-0P400999, 0T409000-1B226999
• 30HP EFI (Mercury): 0P153500-0P400999, 0T409000-1B226999
• 30HP OUTBOARD (Mariner): 0G760300-0T979999, 0P017000-0P325499, 0T980000-0T999999, 0P153500-0P400999, 0T409000-1B226999
• 30HP OUTBOARD (Mercury): 0G760300-0T979999, 0P017000-0P325499, 0T980000-0T999999, 0P153500-0P400999, 0T409000-1B226999

Don’t know where your serial number is? Our quick reference guide shows exactly where to find it on Mercury Marine engines.

Verification & Support

Double-check compatibility for part 69578Q1 using our parts finder tool. Still need assistance? No worries – contact us via the buttons at the bottom of this page (text, call, or email)

Serving boaters for over 40 years. Discount pricing with expert service – shipping daily.