My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-1728 Bellows Flange Ring for MerCruiser Alpha One Gen II

Manufacturer

Picture for manufacturer Sierra

Part Number

118-1728
9 reviews
Sale Price

$17.72

In Stock (5)

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 18-1728 is a precision-machined bellows flange ring designed specifically for MerCruiser Alpha One Generation II stern drives manufactured from 1991 to present (serial numbers 0D469859 and up). This critical transom component ensures a secure seal between the bellows and drive unit, protecting internal components from water intrusion and corrosion.

Key Features:

  • Precision-machined to OEM specifications for exact fit and reliable performance
  • Direct replacement for MerCruiser part number 816607 and Mallory 9-73117
  • Engineered to withstand harsh marine environments and high-performance demands
  • Lightweight design at just 0.04 lbs for easy installation
  • Meets or exceeds original equipment specifications

Sierra Marine has over 50 years of experience manufacturing quality marine engine components, supplying OEM manufacturers and boat builders worldwide. This flange ring is an essential component for bellows system maintenance and should be inspected regularly and replaced as needed to prevent costly drive unit damage. Compatible with MerCruiser Alpha One Gen II, Vazer Drive, and Vazer Transom applications.

The item arrived three days after I ordered it very fast shipping thank you

Easy process

Easy to navigate so far.

Decent

The part I needed was in stock at a fair price and delivery was free. Item delivered in perfect condition in a few days.

Found product at a lower price than a couple of other sites convenient fast shipping with quality of followup of product ordered thanks

Shipping was extremely fast a on a hard to find Item, The price with free shipping was better than buying elsewhere with paid shipping I am very satisfied

Items arrived quickly - don't remember receiving any shipping notification though beforehand

Ordering process was overall pretty simple. Shipping cost was alittle bit higher than expected.

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