Camco 55572 50A 90° Locking Marine Power Adapter

The Camco 55572 is a 50-amp marine-style shore power adapter, and it solves a specific headache: getting a clean, locked connection between a marine-style power inlet and your 50-amp power source. It's an 18-inch pigtail with a 50-amp female connector on one end and a 50-amp male on the other, bent at a right angle so the cord runs tight against the boat instead of jutting straight out.

That 90-degree body is the whole point. On a lot of boats, and on RVs set up with marine-style inlets, the power inlet sits flush on the hull side or a side wall. Plug a straight connector in and it sticks out where it can get bumped, stepped on, or leaned on by a heavy cordset. Over a season that side load works the inlet pins loose. The right-angle turn on the 55572 sends the cord downward and keeps it close to the surface, so the weight of the cable pulls along the hull instead of prying on the connection.

Marine-style inlets and cordsets use a specific locking pattern that's different from a household twist-lock, and that's what this adapter is cut for. Both ends match the standard 50-amp marine pattern, so it drops onto a standard marine inlet and mates to a standard marine cordset without any fiddling. If your inlet and cord are both marine-style 50-amp, this is the connector that ties them together.

It locks, and it's sealed. The twist-lock collar keeps the plug seated through wake slap, engine vibration, and the general nudging that happens at a busy dock. The waterproof body is built to shrug off dockside rain and spray so you're not worrying about water tracking into a live 50-amp connection. One tip from folks who run in salt air: put a little dielectric grease on the locking threads before you first make it up. It keeps the collar from seizing after a few months of salt, and it makes the connection easy to break loose when you need to.

The molded plug head handle is a small thing that you'll appreciate every time you connect or disconnect. Fifty-amp cordsets use heavy 6-gauge cable, and that stuff is stiff and it fights you. The handle gives you something solid to push and pull on, so you're seating the pins straight instead of wrestling the cable. Cleaner connections, less wear on the contacts.

Here's the honest part, because it matters. This is a straight 50-amp to 50-amp adapter. It does not step 30-amp service up to 50, and it doesn't knock 50 down to 30. If you're trying to change amperage between your boat and the dock pedestal, that's a different piece of gear. What the 55572 does is bridge a marine-style 50-amp inlet to a marine-style 50-amp source with a locking, weatherproof, right-angle connection. Match the job to the part and it's exactly right.

A couple of practical notes from the water. The adapter body is 18 inches, which is short by design so it stays tidy at the inlet. But a full 50-amp cordset is heavy, so support the cable with a hanger or a strain-relief loop rather than letting all that weight hang off the plug. And if your boat runs a 50-amp ELCI breaker, this connection plays nicely with it. A clean, dry, locked connection is exactly what keeps those breakers from nuisance-tripping on stray current.

Who's this for? Liveaboards and cruisers with 50-amp service, larger boats pulling real shore power for air conditioning and battery chargers, and marina-style setups where a marine inlet needs to meet a marine cordset. Rinse the connection with fresh water now and then if you run in heavy spray, and check the pins for discoloration at haul-out. Corrosion on 50-amp contacts shows up as heat, and heat is the one thing you want to avoid on a circuit this size. It's a Camco part built to the same standard as the rest of their shore power line, and it carries the full manufacturer warranty. If you've been fighting a straight plug that keeps working loose at the inlet, this right-angle adapter is the fix.