4 Pack Marine Lower Unit Drain Plugs For Mercury MerCruiser Outboard Gear Case Thread Size Three Eighths By Sixteen With Gaskets Magnetic And Non Magnetic Screws Kit For Quick Leak Proof Seal And Easy Maintenance

4-Pack 3/8-16 Marine Lower Unit Drain Plugs ✔️ 4 plugs total: 2 magnetic, 2 non-magnetic with gaskets

These marine lower unit drain plugs seal drain/fill holes on outboard gear cases, helping you maintain a leak-free seal during oil changes and routine service. Designed for 3/8-16 threads, they fit many stern drives and outboard gear cases and are ideal for quick maintenance tasks.

✅ Thread size 3/8-16 for drain or fill holes with gasket seals
✅ Includes 2 magnetic and 2 non-magnetic plugs for different maintenance needs
✅ Made from stainless steel and rubber; durable, wear‑resistant, and leak-proof
✅ Magnetic plug collects metal particles from gear lube to help protect bearings
✅ Dimensions: non-magnetic Ø14 mm x 9 mm (0.55 in x 0.35 in); magnetic Ø14 mm x 17 mm (0.55 in x 0.67 in)

These marine lower unit drain plugs are perfect for boats with stern drives and outboard gear cases, especially when performing oil changes or routine maintenance in marina or workshop settings.

💡 What is a drain plug for a marine lower unit used for during oil changes on stern drives?

It’s a handy part that lets you drain old gear oil and reseal the opening quickly, keeping gear oil contained and preventing leaks.

• Handy for routine gear case maintenance on outboard stern drives
• Helps maintain seal integrity with gasket and proper thread engagement
• Magnetic version traps ferrous debris to protect bearings
• Compatible with common 3/8-16 drain holes in many marine units