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Marinco 500R 50A Threaded Locking Sealing Ring for Shore Power Inlets

Manufacturer

Marinco

<h3>About Marinco</h3><p>Marinco has built a decades-long reputation as one of the most trusted names in marine electrical systems. As part of the <strong>Navico Group</strong> — a global leader in marine, RV, and specialty vehicle technology — Marinco focuses exclusively on the electrical needs of recreational and commercial boaters, delivering products that combine reliability, safety, and ease of installation.</p><p>Boaters depend on their onboard electrical systems in ways that land-vehicle drivers rarely have to think about: shore power connections, battery management, wiper systems that work in salt air and spray, and safety signaling equipment. Marinco has engineered solutions for every one of these demands, earning its place as a go-to brand at marinas and on vessels ranging from modest day cruisers to serious offshore fishing boats.</p><h3>Shore Power &amp; Charging Systems</h3><p>One of Marinco&apos;s most recognized product areas is its shore power ecosystem. The brand&apos;s <a href="/11273-marinco-shorepower-accessories-200944">Shorepower Accessories</a> — including inlets, connectors, cords, and power management products — are designed to meet rigorous marine electrical standards, helping boaters safely draw power from marina pedestals. These products are engineered to resist the corrosion and moisture exposure that define the marine environment.</p><p>Complementing the shore power lineup, Marinco&apos;s <a href="/11273-marinco-battery-chargers-200141">Battery Chargers</a> are built specifically for the demands of marine use. Whether maintaining batteries during off-season storage or keeping house and starting batteries topped off at the dock, Marinco chargers provide reliable multi-bank charging with the safety features boaters require.</p><h3>Windshield Wiper Systems</h3><p>Visibility on the water can be a matter of safety, and Marinco takes it seriously with a full range of wiper products. The brand&apos;s <a href="/11273-marinco-windshield-wiper-motor-8824">Windshield Wiper Motors</a> are purpose-built for marine applications, engineered to withstand constant exposure to salt spray, humidity, and the vibration of an active vessel. Marinco also offers a comprehensive selection of <a href="/201195-windshield-washers-wipers-replacement-motors-marinco-11273">Windshield Washers, Wipers &amp; Replacement Motors</a> so boaters can maintain or upgrade existing systems without replacing the entire assembly — a practical and cost-effective approach for vessel owners.</p><h3>Marine Horns</h3><p>Safety signaling is a legal requirement on the water, and Marinco&apos;s <a href="/11273-marinco-horn-10051">Horns</a> deliver the sound output needed to meet U.S. Coast Guard requirements. Built for the marine environment, these horns resist corrosion and are designed for straightforward installation on a wide variety of vessel types.</p><h3>Why Choose Marinco?</h3><ul style="list-style:disc"><li><strong>Marine-specific engineering:</strong> Every product is designed and tested for the unique challenges of the marine environment — moisture, salt, vibration, and UV exposure.</li><li><strong>Industry standards compliance:</strong> Marinco products are built to meet relevant marine electrical standards, giving boaters peace of mind at the dock and underway.</li><li><strong>Broad compatibility:</strong> With a catalog of over 300 products, Marinco supports a wide range of vessel types and electrical configurations.</li><li><strong>Trusted by professionals:</strong> Marinco products are widely specified by marine technicians and OEM boat builders, a testament to their quality and dependability.</li></ul>

Part Number

500R
09/12/2036 12:15 PM
Sale Price

$8.23

3 left at this price

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Usually delivered within 2 days

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No Hassle Returns

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Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Marinco 500R is a 50-amp threaded locking sealing ring designed to provide maximum moisture protection at the connection point between a shore power cordset and a marine vessel's shore power inlet. Built from durable black Lexan® polycarbonate, this replacement ring is engineered to withstand the harsh conditions of the marine environment.

The 500R threads directly onto the female connector of a 50-amp shore power cordset, creating a weatherproof, watertight seal when connected to the vessel's inlet. It is also compatible for use when combining a 30A EEL cordset with another cordset. Compatible with all Marinco 50-amp inlets — both new and legacy threaded models — and designed to work with most other manufacturers' standard 50-amp inlets.

Key Features:

  • Provides maximum moisture and weatherproof protection for 50-amp shore power connections
  • Threads onto the female connector of a 50A shore power cordset to seal against the vessel's inlet
  • Compatible with all Marinco 50-amp inlets (new and legacy threaded)
  • Also designed for use when combining a 30A EEL cordset with another cordset
  • Constructed from rugged black Lexan® polycarbonate for long-lasting marine durability
  • RoHS Compliant (Restriction of Hazardous Substances Directive)
  • Weatherproof boots and sealing collars sold separately

The Marinco 500R is the standard replacement sealing ring for 50-amp shore power systems, ensuring a secure, weathertight connection every time you plug in. Five-year warranty.

Products specifications

Amperage

50 Amps

Type

Sealing Rings

Voltage

125 Volts

Warranty Details

Five Years

Got the order fast and got it installed just in time for a fishing trip.....thanks bostplicity.

Great experience. Competitive price.

Have not had time to install, I will let you know how it turns out. Thanks

Very easy to deal with. All of the products showed up NIB as promised, and the delivery was very quick. Would certainly use these folks again.

FAST AND GOOD PRICE

Thank you

Quick and hassle free

I usually have trouble with this, but it was easy

The website was very easy to use and had the prop I was looking for.

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