FREE Standard Shipping on Orders $99+ (Contiguous US only).

Skip to content

Products search

Shop by Departments
Locations
Maintenance
Outboard Engines
Anchor & Dock
Safety
Electrical
Electronics
Engine Systems
Hardware
Seating
Brands
Clearance
Gift Cards
â€¢ Track Your Order

Shop by Departments
Locations
Maintenance
Outboard Engines
Anchor & Dock
Safety
Electrical
Electronics
Engine Systems
Hardware
Seating
Brands
Clearance
Gift Cards
â€¢ Track Your Order

18-4457

Home » 18-4457

Showing the single result

Add to cart
Estimated delivery dates: Jan 16, 2026 - Jan 22, 2026
11 In Stock
Sierra 4in Exhaust Flapper, Replaces: Mercruiser 12644A1, 12644Q01 – 18-4457
$58.43 Add to cart

4IN EXHAUST FLA

(800) 262-8799
info@bow.com
Customer Service:
Mon.-Fri. 8:00AM - 4:30PM EST

Join Us

Facebook-f Instagram X-twitter

CUSTOMER SERVICE
Track Your Order
About Us
Contact Us
FAQ
Locations
Blog

POLICIES
Privacy Policy
Return Policy
Shipping and Handling Policy
Terms and Conditions

AMEX, MasterCard, Visa, Discover credit card icons

Copyright © 2025 Boat Owners Warehouse. All right reserved.

✕

Search

COLLECTIONS

Shop by Departments
Locations
Maintenance
Outboard Engines
Anchor & Dock
Safety
Electrical
Electronics
Engine Systems
Hardware
Seating
Brands
Clearance
Gift Cards
â€¢ Track Your Order

Shop by Departments
Locations
Maintenance
Outboard Engines
Anchor & Dock
Safety
Electrical
Electronics
Engine Systems
Hardware
Seating
Brands
Clearance
Gift Cards
â€¢ Track Your Order

Need Help?
Ph: 954-522-7998
Or Contact Us here

Username or Email Address

Password

Remember Me

Lost your password?

Username or Email Address

Password

Remember Me

Lost your password?

Register