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Mercury Mariner 135-200hp Base Gasket (OSBG991)

Genuine Part # : 27-99176 4, 18-2506-1

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  • 1 YEAR


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This part replaces part #: 27-99176 4, 18-2506-1.

This part suits the following engines: Mercury Mariner 135-200hp V6 2.5litre 2 Stroke 1994-2014.


About The Brand

Outboard Spares brand of parts are tested in Australia's harsh marine environment with a focus on quality and durability. Outboard Spares parts are used by professional fishermen who depend on their parts to stay on the water and in business. So next time you service your engine choose what the professionals use, choose Outboard Spares.

Standard Shipping is FREE on all orders or Express Shipping is $10 flat rate.

Oils & Lubricants can only be sent via Standard Shipping.

Delivery Time

Orders are dispatched same business day if ordered before 3:30pm AEDT. All orders are dispatched from Melbourne, Victoria and are sent via Australia Post.

For delivery time estimates with Australia Post please use their delivery calculator here:

If you have any questions relating to shipping, please contact us by emailing

Manifold plate gasket

By: on 25 February 2019
Perfect for the job. Good quality material and well made. Recommend outboard spares.

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