Scanstrut TBH-4 Through Bulkhead Cable Seal

The Scanstrut TBH-4 Through Bulkhead Cable Seal is purpose-built for serious boaters and marine electricians who demand watertight integrity at cable penetration points. Whether you're running windlass power cables, GPS antennas, fishfinder transducers, or control wiring through your boat's cabin bulkhead, this seal prevents water ingress that can corrode connections, damage electronics, and compromise safety on the water. Constructed to Scanstrut's exacting marine standards, it accommodates multiple cables simultaneously, making it ideal for modern vessels with complex electrical systems.

The TBH-4's engineering centers on a robust through-bulkhead gland design with individual cable entry points that create compression seals around each wire. This modular approach means you install once and route multiple conductors without compromising the watertight barrier—a critical advantage over improvised solutions like silicone caulk or generic rubber grommets that degrade under UV and thermal cycling. The compact footprint (4 x 4 x 5 inches) fits tight mounting spaces, while the 0.45 lb weight ensures no structural penalty even on lightweight hulls. Marine-grade materials resist saltwater corrosion, fuel vapors, and temperature extremes typical of engine compartments and mast base installations.

Experienced anglers and liveaboard cruisers recognize the Scanstrut TBH-4 as the standard solution for professional-grade cable management in salt and freshwater environments. Installation is straightforward for builders and retrofit projects: the gland mounts flush or slightly proud of the bulkhead, cables feed through individually sealed ports, and tightening the compression nuts locks each wire securely. This approach works across aluminum, fiberglass, and wood hulls, and is fully compatible with standard marine electrical cable diameters (typical gauges 6 AWG through 16 AWG). For anyone upgrading navigation systems, adding redundant electronics, or rebuilding after extended use, the TBH-4 eliminates the guesswork of waterproofing and delivers years of reliable service without maintenance.