Water Pump Impeller Repair Kit with Stainless Steel Housing (Including Impeller Housing) for Mercury / Mariner Outboards

High-quality water pump impeller repair kit including a full stainless steel (SST) impeller housing. Designed for Mercury and Mariner outboards from 25HP to 50HP, this premium kit provides superior durability and cooling performance compared to standard plastic housings. Ideal for both 2-stroke and 4-stroke models across multiple cylinder configurations.

Fits the following Mercury / Mariner outboard models:

Will fit only models with gear housing – drive shaft 2:1 gear ratio. Standard gearbox only. Not compatible with BigFoot models- except 25 hp

4-Stroke Models:
• 25HP BigFoot (1998–2005)
• 30HP 3 Cyl, 3 Carbs
• 40HP 3 Cyl, 3 Carbs
• 50HP 4 Cyl, 4 Carbs (1.83:1 / 2:1 Gear Ratio, non-BigFoot)

2-Stroke Models:
• 30HP 2 Cyl, single carb (1995 and up, excluding engines with serial numbers starting with 0N0...)
• 40HP 2 Cyl, single carb (1995 and up)
• 40HP 3 Cyl, 3 Carbs (1995 and up)
• 50HP 3 Cyl, 3 Carbs (1998 and up, non-BigFoot)

Replaces Mercury Part Numbers:
821354A2, 821354A1, 821354A4 , 46-821351A3 , 821351A3

Product Features:
• Marine-grade aftermarket repair kit
• Includes stainless steel impeller housing (SST cup included)
• Complete kit with impeller, wear plate, gaskets, o-rings & hardware
• Increases corrosion resistance and service life
• Direct-fit replacement for original parts
• Suitable for salt and freshwater applications

Please check compatibility before purchasing.
It is the buyer’s responsibility to ensure this part fits your engine.
Not sure? Message us — our SSI Marine team is happy to help!

Why Buy from SSI Marine?
• Quality marine parts at competitive prices
• UK stock — same-day dispatch before 1 PM
• Tracked 24-hour delivery
• Friendly, expert customer service

Order now from SSI Marine — trusted for reliable outboard parts and fast UK shipping.

Mercury Mariner 25–50HP Water Pump impeller Repair Kit incl Housing for | Replaces 821354A2