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Mercury Mariner 25-50hp Water Pump Kit (OSWK821)

Genuine Part # : 821351A3

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  • 1 YEAR


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Suits USA built models only.

This part replaces part #: 821351A3.

This part suits the following engines:
2 Stroke
Mercury Mariner 30hp 2 Stroke 2:00:1 gear ratio models 1993-2006 (serial numbers 0G055314 & up),
Mercury Mariner 40hp 2 Stroke 2 Cylinder 2:00:1 gear ratio models 1993-2006 (serial numbers 0G055314 & up),
Mercury Mariner 40hp 2 Stroke 3 Cylinder 1:83:1 gear ratio models 1993-2006 (serial numbers 0G055314 & up),
Mercury Mariner 50hp 2 Stroke 3 Cylinder 1:83 gear ratio models 1993-2015 (serial numbers 0G590000 & up),

4 Stroke
Mercury Mariner 25hp 4 Stroke 1998-2004 (serial numbers 0G590000 to 1B344298),
Mercury Mariner 30hp 4 Stroke 1998-2004 (serial numbers 0G760300 to 1B226999),
Mercury Mariner 30hp 4 Stroke EFI models 1998-2004 (serial numbers 0G409000 to 1B226999),
Mercury Mariner 40hp 4 Stroke 3 Cylinder 2:1 & 1:83:1 gear ratio models 1998-2004 (serial numbers 0G231123 to 0T408999),

Mercury Mariner 50hp 4 Stroke 3 Cylinder 1998-2004 (serial numbers 0G231123 to 0T178499).


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

Water pump

By: on 22 September 2021
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Spare parts

By: on 14 September 2020
Very good service and fast delivery and I'm very happy with this company

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