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Sierra 18-3151 Water Coupling Assembly

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

18-3151
06/02/2036 10:10 AM
Sale Price

$13.46

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3151 is a replacement water coupling assembly designed for MerCruiser stern drive cooling systems. This precision-engineered coupling component ensures reliable water flow through your marine engine's cooling circuit, helping maintain optimal operating temperatures and prevent overheating.

Key Features:

  • Direct replacement for MerCruiser OEM part number 816597A1
  • Compatible with Alpha One Gen II drives (1991-2019) and Vazer Drive applications (1998)
  • Fits multiple Mercury outboard engines including 200-250hp models (1994-1998)
  • Constructed from durable materials for long-lasting marine environment performance
  • Lightweight design at approximately 0.32 ounces

Cross-Reference Numbers: GLM 12041, GLM 12824, Mallory 9-78110, MerCruiser 816597A1

This water coupling assembly is an essential component in your marine drive's cooling system, connecting water tubes to ensure proper coolant circulation. Sierra marine parts are manufactured to meet or exceed OEM specifications, providing reliable performance and value for boat owners and marine technicians.

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Very Quick and easy to place an order, let's see how fast it arrives!

Best price

Great service so far

My first order did not include all parts. I'm ordering a different part number now. The seller is giving me a discount due to this inconvenience. We will see how it goes.

Good prices. Fast shipping. Fit my 2011 Dodge 3500 Mega Cab Dually perfect. Thanks.

quick and easy ordering process

Great priced items. was WAY under what others wanted. shipped fast also. A+ seller. I will buy from again.

Very Good.

good

GOOD SERVICE, FAST SHIP, CHEAP PRICE

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