Marinco RY504-2-30 Reverse "Y" Adapter Dock Side Male 2-30A 125V Locking to Boat Side Female 50A 125/250V With Sealing Collar System
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Marinco Reverse “Y” Adapter (RY504-2-30 / 69-RY504230) delivers 50A 125/250V power to a boat-side 50A inlet using two dock receptacles rated 30A 125V. Built with special power isolation circuitry and a sealing collar system for a secure, weather-ready connection.
Key Features
- Special power isolation circuitry helps isolate the second plug if one dock receptacle is connected—helping prevent power flow through the other cord path.
- Provides 50A 125/250V power from two (2) 30A 125V dock-side receptacles.
- Boat-side female connection uses a sealing collar system to help support a tight, sealing-style dock/shore power connection.
- Dock-side circuits limit current in each circuit to 30A even though the boat-side system is 50A 125/250V.
Intended Use
- Shore power adapters for boats with a 50A 125/250V inlet that need to be powered from two available 30A 125V dock receptacles.
- Use in marine shore power systems where a reverse “Y” split/combination of two dock circuits is required (per adapter operation requirements).
Product Details
- Manufacturer/Model: Marinco RY504-2-30 Reverse “Y” Adapter (SKU: 69-RY504230).
- Dock Side (Male): Two (2) 30A 125V locking male plugs.
- Boat Side (Female): 50A 125/250V female connection.
- Power/Operation: Provides 50A 125/250V power to the boat using two (2) 30A 125V receptacles.
- Circuit Behavior: Power is provided in both circuits to the 4-wire inlet, with dock-side receptacles limiting each circuit to 30A.
- Sealing: Female end includes a sealing collar system.
- Operational Note: Reverse “Y” will NOT work with 50A, 125V, 3-wire inlets.
- Operational Requirement: The two 30A 125V receptacles must be supplied from a single power source providing from 208V to 250V between them for proper operation.
Parts Desk Insights
Best Use Case: Ideal when your boat has a 50A 125/250V inlet, but the marina provides two separate 30A 125V receptacles next to each other—so you can run your shore power through the adapter’s isolation and sealing system.
Common Issues: Common problems come from using the wrong inlet type (the adapter won’t work with 50A, 125V, 3-wire inlets) or plugging the two dock circuits into unrelated sources (operation requires a single power source with 208V–250V between the receptacles). If the adapter isn’t energizing as expected, double-check the dock-side circuit breakers/availability and confirm both 30A receptacles are on the proper shared supply.
Related Products & Accessories
- Browse Shore Power - Explore the Shore Power collection for compatible Marinco adapters, inlet connections, and electrical shore accessories.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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