My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3423 Marine Water Pump Base for Mercury/Mariner Outboard

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3423
11 reviews
Sale Price

$34.88

2 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3423 is a replacement water pump base designed for Mercury and Mariner outboard motors. This component serves as the structural foundation of the outboard's cooling system water pump assembly, providing a precise-fit mounting platform for the impeller and pump housing. Sierra manufactures this part to meet or exceed the quality of the original equipment it replaces.

Key Features:

  • Direct replacement for OEM Mercury Marine part number 46-73640A1
  • Meets or exceeds original equipment quality and specifications
  • Interchangeable with GLM 12020 and Mallory 9-15057 / 9-43301
  • Precision-molded for proper fit and sealing in the lower unit
  • Designed for use with Mercury and Mariner outboard lower units

OEM Cross-Reference:

  • Mercury Marine: 46-73640A1
  • GLM: 12020
  • Mallory: 9-15057, 9-43301

The Sierra 18-3423 water pump base is a critical component in maintaining proper engine cooling. Replacing a worn or damaged water pump base restores the integrity of the cooling system and helps prevent overheating. Sierra International is a trusted name in aftermarket marine parts, offering a broad range of replacement components engineered for reliability on the water.

Fast checkout

Fast, easy, good prices

Great

Easy to use

Autoplicity was quick and easy to order from. I found just what I was looking for in absolutely no time at all, plus it was shipped extremely quickly. I would definitely order from this site/company again.<br><br>Thanks!

great

Quick and Easy

Great and Easy to Use Website

Very nice service

Excellent prices and fast shipping. Placing another order as I type. Great seller.

Quick and easy to purchase but took four days for the processing and to get shipped

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy