This Marinco watertight PVC cap is an indispensable accessory for any boater or marine electrician using shore power. Whenever the shore power cable is unplugged from your boat’s inlet or the dock outlet, the exposed plug end becomes vulnerable to the environment. The Marinco cover fits directly over the plug, completely sealing the contact openings and preventing the intrusion of water, salty mist, dust, or other contaminants.
The cap is made from a special high-strength thermoplastic reinforced with glass fibers, which makes it resistant to both mechanical stress and long-term exposure to UV rays and salt. It is designed with a universal size that allows it to fit a variety of Marinco plugs – from the smaller 32A/230V European standard connectors up to the larger 63A/125V ones (often used on bigger vessels or specific power systems). Thanks to its flexibility, the cap conforms to the shape and diameter of the plug, providing a watertight, snug fit with minimal effort.
Usage & Benefits:
- Protection When Unplugged: After disconnecting your shore power cable from the boat or dock, immediately place the cap over the free end of the plug. This shields the plug while it’s sitting on your deck, on the dock, or in storage, so that the next time you go to connect, the contacts are dry and clean.
- Extended Connector Life: By keeping moisture and salt out, the cap greatly prolongs the life of your valuable plug. Corroded pins can cause overheating, poor electrical contact, or equipment damage – preventing these issues with a simple cover is a smart investment.
- Underway at Sea: When your boat is at sea, the shore power cable is typically stowed away. The cover ensures that even when stored in a locker or compartment, the plug won’t accumulate dust, sand, or salt crystals in its openings. This is especially useful on long voyages or in rough conditions where salt spray finds its way everywhere.
- For Spare Parts: If you have a spare plug or adapter kept for emergencies, store it with a cap on. That way, when the time comes to use it, it will be in perfect condition with no rust or dirt impacting its performance.
- Maintenance: The PVC material requires no special care – simply rinse it with fresh water if it’s been exposed to salt, and let it dry. Check that the interior sealing surface of the cap is clean and wipe it if needed. Keep the cap handy near your power cable (many caps have a loop or tether to attach to the cord so it doesn’t get lost).




