Description

Restore proper gearcase sealing during lower unit service with the Mercury MerCruiser Screw Kit 8M0058388. This genuine Mercury Marine OEM screw kit is designed for gearcase drain and vent ports on Mercury outboards and MerCruiser sterndrives.

The kit includes replacement drain and vent screws used when servicing gear lube in the lower unit. Using OEM Mercury hardware ensures correct thread fitment, proper sealing, and reliable performance in harsh marine environments where corrosion resistance and sealing integrity are critical.

Key Features

• Genuine Mercury Marine OEM screw kit

• Designed for gearcase drain and vent plug replacement

• Precision threads for proper OEM fit and sealing

• Corrosion-resistant construction for marine environments

• Helps maintain proper gear lube containment

• Direct replacement for worn or damaged drain screws

Part Details

OEM Part Number: 8M0058388
Mercury Reference Number: 22-8M0058388
Product Type: Gearcase drain and vent screw kit

Thread Size: 3/8-16
Application: Gearcase drain and vent ports

Typical Packaging: Screw kit for gearcase service

Compatible Mercury & MerCruiser Engines

Used on many gearcases with standard 3/8-16 drain and vent screws, including:

Mercury Outboards

• Mercury 2.5HP – 400HP outboards

• Mercury Two-Stroke outboards

• Mercury FourStroke outboards

• Mercury Pro XS outboards

• Mercury Verado outboards

MerCruiser Sterndrives

• Alpha One

• Alpha One Gen II

• Bravo One

• Bravo Two

• Bravo Three

Function

The drain and vent screws are used to seal the gearcase after servicing gear lube. They allow technicians to safely drain old lubricant and refill the gearcase while maintaining a watertight seal once service is complete.

Replacing worn screws helps:

• Prevent gear oil leaks

• Maintain proper gearcase sealing

• Protect internal gears from water intrusion

• Ensure reliable gearcase lubrication

Important Compatibility Note

Gearcase drain screw sizes and designs can vary depending on engine model, gearcase type, and production year. Always verify compatibility using the engine or sterndrive serial number before ordering to ensure the correct screw kit.

Shipping: Ships same or next day for fast Canada wide shipping.