Mercury 200-225-250-300 EFI-DFI 3.0L Gasket Air Plenum REED Adapter 27-825815 2X

Gasket Air Plenum Reed Adapter for Mercury

This gasket for Mercury 200-300 HP EFI/DFI 3.0L outboards seals the air plenum to the reed adapter, ensuring proper air-fuel mixture delivery, with OEM cross-reference number 27-825815 and supplied as a set of two.

Overview

This high-quality gasket is designed for Mercury outboard engines in the 200-300 horsepower range with EFI/DFI fuel systems and 3.0L displacement. It provides a secure seal between the air plenum and reed adapter, preventing air leaks that can cause rough idling and loss of power. Engineered to match OEM specifications, this gasket is a reliable replacement for your Mercury outboard.

Built For Performance

• Precision-cut for a perfect sealing surface
• Resistant to fuels, oils, and high temperatures
• Includes two gaskets for a complete replacement
• Restores optimal air intake for better combustion
• Direct replacement for OEM part 27-825815

Fits These Machines

• for Mercury 200 HP EFI/DFI 3.0L
• for Mercury 225 HP EFI/DFI 3.0L
• for Mercury 250 HP EFI/DFI 3.0L
• for Mercury 300 HP EFI/DFI 3.0L

On-The-Job Use

• Seals the air plenum connection to maintain proper manifold pressure
• Prevents unmetered air from entering the intake system
• Ensures consistent fuel-air mix for smooth acceleration
• Used during routine maintenance of the reed valve assembly

Specs At A Glance

Good To Know

Q: Why is this gasket important for engine performance? A: A proper seal between the air plenum and reed adapter prevents air leaks, which can cause lean fuel mixtures, poor idle, and loss of torque.

Q: Can I use this gasket on older Mercury engines? A: It is specifically designed for 3.0L EFI/DFI models from 200 to 300 horsepower, so check your engine's specifications before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.