Seacocks & Thru-Hulls

Everything for secure and watertight hull penetrations on board

Ensuring reliable hull penetrations is critical to maritime safety. In our Seacocks & Thru-Hulls category, you will find a complete selection of ball valves, thru-hull fittings, sealing materials, and skin fittings for all plumbing lines passing above or below the waterline. Whether routing raw cooling water to the engine, discharging waste from marine toilets, or draining deck scuppers: high-quality seacock systems protect your vessel against corrosion and water ingress.

Brass, bronze, stainless steel, and composite (TruDesign)

Depending on your vessel's hull material, operating waters, and personal preference, choose from various materials:

• Composite (TruDesign): Completely immune to electrolysis and galvanic corrosion; lightweight and ideal for both salt and fresh water.

• Bronze & DZR Brass: Traditional heavy-duty metal fittings offering exceptional strength and resistance to marine corrosion.

• Stainless steel (AISI 316): Delivers high structural integrity and a clean exterior finish for above- or below-waterline use.

• Straight & elbow hose barbs: Essential connectors for securing flexible hoses to ball valves and skin fittings.

Below-waterline safety and maintenance

Seacocks and thru-hulls positioned below the waterline require regular inspection for corrosion, scaling, or mechanical binding. Always use suitable thread sealants, match thread standards correctly, and double-clamp every hose barb using marine-grade stainless steel hose clamps to guarantee maximum security.

At Marine-Outlet, you can easily order all seacocks, thru-hulls, and hose fittings online. Explore our range and secure your hull with confidence.