UANOFCN Outboard Water Pump Impeller Kit for Mercury 30–60 HP — 3.44 in torpedo, neoprene impeller & stainless wear plate

The UANOFCN 812966A12 outboard water pump impeller kit is a full replacement kit engineered to restore cooling flow in Mercury 4-stroke 30–60 HP lower units when the torpedo measures 3.44 in (87.38 mm).

If your Mercury 30–60 HP EFI outboard is running hot or showing reduced water discharge, this kit supplies the core components needed to rebuild the lower-unit water pump. It replaces several OEM numbers and brings together the impeller, wear plate, housings, seals, gaskets, and hardware so you can perform a thorough repair without sourcing parts separately. Note: measure the torpedo diameter before ordering and choose the long tube seal only for 4-stroke engines; 2-stroke units require a short tube seal.

How will this kit help restore my outboard's cooling performance?

Worn impellers and damaged seals let cooling water bypass or stop flowing. This kit replaces the impeller and the supporting components that ensure a tight pumping chamber, restoring consistent water flow through the engine’s cooling passages.

• Includes neoprene impeller designed to re-establish impeller vanes and suction.
• Stainless-steel wear plate reduces abrasion and improves longevity.
• New gaskets and O-rings prevent leaks that reduce pump pressure.
• Full hardware set simplifies an accurate rebuild in one job.

Which Mercury models and part numbers does this replace?

This assembly is compatible with Mercury Marine 4-stroke 30, 40, 50 and 60 HP EFI lower units when the specified torpedo diameter matches. It cross-references multiple OEM and aftermarket numbers so you can confirm compatibility before buying.

• Fits Mercury Marine 4-stroke 30–60 HP EFI lower unit gearcase parts.
• Replaces Mercury part numbers such as 812966A12 and related variants.
• Cross-compatible with Sierra 18-3690 and other listed replacements.
• Measure torpedo diameter: requires 3.44 in (87.38 mm) to match this kit.

What components and materials are included in the kit?

The kit bundles the major internal pump parts and sealing hardware so you can do a complete overhaul of the pump area. Materials are selected for durability in salt and freshwater service around the impeller and wear surfaces.

• Neoprene impeller (47-19453T) for flexible vane performance.
• Stainless-steel wear plate and pump hardware for corrosion resistance.
• Nylon PA66 tube, non-asbestos gasket material, and multiple O-rings and seals.
• Complete list: wear plate, pump base, housing, tube seal, upper/lower gaskets, impeller key, O-rings, washers, and seals.

How do I choose the correct tube seal and confirm fit?

Before purchase, measure the torpedo diameter at the lower unit—this kit is sized for a 3.44 in (87.38 mm) torpedo. Also verify your engine is a 4-stroke if you need the long tube seal included; 2-stroke engines require the shorter seal variant.

• Measure torpedo diameter precisely; kit requires 3.44 in (87.38 mm).
• Long tube seal supplied for 4-stroke lower units only.
• If your engine is 2-stroke, obtain the short tube seal alternative before installation.
• Compare OEM part numbers listed to ensure matching fitment.

Who this product is for: Boat owners and marine mechanics who service Mercury 30–60 HP 4-stroke outboards and want a one-box solution for a pump rebuild. It's ideal if you prefer replacing all wear items at once—impeller, sealing components, and wear surfaces—so you return the lower unit to reliable cooling performance without multiple orders. Confirm the torpedo diameter and engine stroke type before ordering to ensure correct fit and seal length.