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Sierra 18-2732-9 MerCruiser Exhaust Water Shutter 2-Pack

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

118-2732-9
06/03/2036 9:23 AM
Sale Price

$73.88

In Stock (8)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-2732-9 water shutters act as one-way valves that prevent water from traveling backwards into the exhaust risers, manifolds, or engine cylinders. When the engine is not running, these flappers spring open to block following seas or waves from entering the exhaust system. This bell-type water shutter is constructed of rubber and steel materials and measures 6.125 inches in height by 2.360 inches long.

Key Features:

  • Includes two water shutters per package
  • Fits 4-inch exhaust for Mercury Marine MC-1/R/MR/Alpha One, Alpha Gen II and Bravo stern drives
  • Pin included with each shutter
  • Meets or exceeds original equipment specifications
  • Engineered to match OEM shutters on MerCruiser installations

Water shutters are exposed to repeated heat cycling and saltwater abuse that can speed up the corrosion process and cause failure, making routine inspection and replacement strongly advised to protect your engine. This part is interchangeable with Mallory 9-42802, GLM 89170, and MerCruiser Stern Drive 14348, 14348A1, 14348A2, and 807166A3.

I would like to be able to put in my apartment number

good prices and quick delivery

Received everything and it was well packaged. Thank you

Shipping was slow, but item arrived 2 days earlier than expected. A good shopping experience was expected and was received.

Everything was easy and quick

Quick and easy process!

Very easy website to navigate and order from. Payment process was quick and easy as well. Delivery schedule was as promised and arrived as scheduled.

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