Water Tube Gasket – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 27-192012)

Product Details

This aftermarket Water Tube Gasket – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 27-192012) ensures a proper seal for your engine's cooling system. It is designed for a wide range of Mercury and Mariner 6–15 HP 2-Stroke outboards manufactured between 1975–2006, and is also compatible with various Sea Pro, Marathon, and Viking models.

This part serves as a direct replacement for Mercury OEM part numbers 27-192012, 27-19201, and 27-42464, providing a reliable interchange component.

• Installs between the water tube and the driveshaft housing to prevent coolant leaks.
• Constructed from high-quality gasket compound to withstand the marine environment.
• Engineered to meet or exceed original equipment specifications for fit and function.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.

Engine & Model Compatibility

Confirm your engine model and year/serial number in the table below to ensure correct fitment.

This gasket fits a wide variety of 2-stroke outboards from Mercury and Mariner, including specialty models like the Sea Pro, Marathon, Magnum, and XR10 series.

Technical Specs

Product Type

Water Tube Housing Gasket

Installation

Between water tube and driveshaft housing

Material

Gasket compound

Dimensions

9.0" L x 9.5" W x 0.1" H

OEM Number

27-192012

Superseded Parts

27-19201, 27-42464

Country of Manufacture

Japan

What’s in the Box

• 1 x Gasket (27-192012)

Installation Notes

1. Ensure the engine is off, cool, and disconnected from the battery.
2. Remove the lower unit (gearcase) assembly from the outboard's midsection following the manufacturer's service manual.
3. Locate the water tube connection point at the top of the driveshaft housing and identify the old gasket.
4. Carefully remove the old water tube gasket.
5. Thoroughly clean both mating surfaces, ensuring they are free of any old gasket material, corrosion, or debris.
6. Position the new gasket (27-192012) correctly onto the driveshaft housing.
7. Carefully reinstall the lower unit, ensuring the water tube aligns correctly with the new gasket and water pump housing.
8. Tighten all bolts to the manufacturer's specified torque values.
9. Reconnect the battery, start the engine using a water supply, and check for leaks and proper water circulation (tell-tale stream).

Troubleshooting & FAQ

Safety & Important Info

• Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.