Stop fighting with your Mercury engine. This factory-spec FITTING ASSEMBLY, Drain Part Is New And Listed For The First Time eliminates common issues and delivers the smooth operation you expect from genuine OEM components.

Built with Mercury Marine’s precision engineering, this component ensures reliable operation across all engine RPM ranges. Part number 863786A1 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.

Aftermarket parts might save a few dollars upfront, but genuine Mercury Marine part 863786A1 saves you money long-term by lasting years instead of months. Factory precision means perfect fit — no modifications, no surprises.

Compatible Mercury Marine Engines

FITS: 350HP MERCRUISER

• Fits MERCRUISER 350HP engines
• Compatible HP: 350HP
• Covers 24 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

350HP Models

• 350HP MAG MPI (Mercruiser): 0M300000-0M599999, 0M600000-0W059999, 0W060000-0W309999, 0W310000-0W649999, 0W650000-1A299999, 1A300000-1A611927, 1A611928-1A623184, 0M310000-0M316999, 0M398372-0W389999, 0W390000-0W689999, 0W690000-1A089999
• 350HP MAG MPI MIE (Mercruiser): 0M310000-0M316999
• 350HP OUTBOARD (Mercruiser): 0M300000-0M599999, 0M600000-0W059999, 0W060000-0W309999, 0W310000-0W649999, 0W650000-1A299999, 1A300000-1A611927, 1A611928-1A623184, 1A300000-1A611927, 1A611928-1A623184

Looking for your Mercury engine serial number? Our helpful guide shows you exactly where serial numbers are located on different engines.

Verification & Support

Not sure if part 863786A1 fits your engine? Try our parts finder tool — it’s quick and easy. Need expert help? Contact us using the buttons at the bottom of this page – text, call, or email, whatever works best for you

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