Mercury – NMEA 2000 Weather Cap | Protective Network Cover | 86-8M6000708

Overview

An open NMEA 2000 port can let in moisture, dirt, or corrosion—any of which can create frustrating network issues down the road. The Mercury 86-8M6000708 NMEA 2000 Weather Cap gives you a simple, secure way to seal an unused N2K connector. With a male-thread-in design, it screws directly into an open network port and keeps the backbone protected when a device or drop cable isn’t attached.

Key Features

• N2K Port Protection – Seals an unused NMEA 2000 connector to prevent moisture or debris intrusion.
• Male Thread-In Cap – Designed to screw into standard NMEA 2000 Micro-C style ports.
• Preserves Network Health – Helps avoid corrosion, intermittent data issues, and accidental shorting.
• Marine-Ready Construction – Durable, sealed materials built for long-term exposure to spray and vibration.
• Simple Install – Just thread the cap into any open NMEA 2000 port and tighten by hand.

Compatibility

• All NMEA 2000 networks
• Standard 5-pin Micro-C connectors
• Open ports on tees, junction boxes, adapters, and network hubs

Performance & Practical Benefits

This cap keeps your network’s unused ports dry and protected, extending the life of your connectors and preventing the kind of electrical noise or corrosion that can cause mystery dropouts. It’s especially handy on networks that are still growing, giving you a clean way to secure a port until new devices or sensors are added.

Why Buy OEM

A loose or poorly sealed cap can let in moisture or salt, and that’s all it takes to sabotage an NMEA 2000 network. Mercury’s OEM cap fits tightly, seals properly, and uses materials that hold up in real marine environments. It’s a small part, but it protects the backbone from expensive troubleshooting later.

FAQ

Q1: When should I use this weather cap?
Whenever an NMEA 2000 port is unused and needs to be sealed to prevent moisture or corrosion.

Q2: Does it work with any N2K system?
Yes—any standard Micro-C NMEA 2000 connector.

Q3: Does this cap terminate the network?
No. It only seals the port. Network termination still requires proper resistors.

Q4: Can I leave it installed full-time?
Yes. It’s designed for long-term protection.

Q5: Do I need tools to install it?
No. It threads in by hand.