Blue Sea Systems CableClam Waterproof Cable Pass Through - Neat

Our review of the Blue Sea Systems CableClam finds it is a straightforward, purpose-built solution for boaters and marine technicians who need a neat, watertight entry for antenna and coax cables. The biggest reason to buy is its combination of a polished 316 stainless steel dress cap and pre-drilled, slit rubber seals that allow cables to pass through with connectors attached while keeping water out. This review focuses on real-world installation ease, durability in a UV-exposed environment, and how well the unit protects cable terminations on deck or mast penetrations.

Key Features

• Waterproof pass through: Keeps antenna and coax connections dry at the deck or bulkhead without removing connectors, reducing installation time and exposure to corrosion.
• Pre-drilled rubber seals: Slit and pre-drilled seals make it easier to insert cables while preserving a tight seal around different cable diameters.
• 316 stainless steel dress cap: A polished cap conceals mounting hardware and resists rust and pitting in marine environments for long-lasting appearance.
• Includes stainless fasteners: Corrosion-resistant fasteners are provided, so the install kit is complete and compatible with the dress cap finish.
• Designed for antennas: The form factor and seal arrangement are tailored for antenna cable routing, making it a common choice around masts and electronics hubs.

Who It's For

The CableClam is aimed at boat owners, riggers, and installers who need a tidy, durable way to route active antenna cables through deck or bulkhead areas. It is especially useful when connectors are already installed on the cable and removing them would be difficult or risk damage. The polished cap also suits owners who want a finished look on exposed deck fittings.

Those who should look elsewhere include projects that require integrated cable glands for electrical power or very large conduit entries, and installations needing an inline weatherproof connector with electrical isolation. This is a pass-through for signal cables rather than a multi-cable gland or junction housing.

Pros & Cons

Pros

• Provides a reliable waterproof pass through so antenna connectors can remain attached during routing.
• Pre-drilled and slit rubber seals speed installation and maintain a snug fit around varied cable sizes.
• Polished 316 stainless dress cap offers corrosion resistance and a clean, protected finish.
• Includes stainless steel fasteners so installers have the correct hardware on hand.

Cons

• Limited to pass-through applications for signal cables and not intended as a sealed electrical junction box.
• May require careful sizing selection for very large or irregularly shaped connectors to achieve a perfect seal.

Specifications

Product type	Waterproof cable pass through
Primary use	Antenna and coax cable routing
Seal material	Pre-drilled and slit rubber seals
Dress cap	Polished 316 stainless steel
Fasteners	Stainless steel hardware included
Installation	Deck or bulkhead mount for pass-throughs

Our Verdict

The CableClam is a practical, well-made pass-through that excels where antenna integrity and appearance matter. It is good value for boaters who want a watertight entry without removing connectors, combining durable 316 stainless protection with user-friendly seals. Choose it for antenna and coax routing on decks or masts; pick a different product if you need a full electrical gland or large multi-cable housing.

Frequently Asked Questions

Can connectors stay attached when routing cables?
Yes. The design allows connectors to remain on the cable while passing through, avoiding disassembly.

Is the dress cap corrosion resistant?
Yes. The polished 316 stainless steel dress cap resists rust and UV exposure in marine settings.

Does it include mounting hardware?
Yes. Stainless steel fasteners are included for a complete installation.