Thru-Hulls, Seacocks & Strainers
Shop Thru-Hulls, Seacocks & Strainers selected for reliable performance, practical value, and everyday use. Explore trusted brands and proven designs from CritPro.
Marine Thru-Hull Fittings, Seacocks & Strainers
Every fitting that passes through your hull below the waterline is a potential point of failure, which is exactly why it deserves better than a "good enough" part. CritPro carries thru-hulls, seacocks, and strainers built to hold up under constant water pressure and exposure, as part of our full boating selection for boat owners who don't want to think twice about what's below the waterline.
What to Look for in Thru-Hulls, Seacocks & Strainers
Bronze and marine-grade composite thru-hulls resist corrosion far better than lesser materials, and mixing incompatible metals below the waterline is one of the more common causes of galvanic corrosion that eats through fittings from the inside. Match seacock size exactly to the hose and thru-hull it connects, an undersized or mismatched seacock is both a performance and a safety issue.
Strainers protect pumps and intakes from debris, and matching strainer capacity to your pump's flow rate keeps water moving without restriction. Every seacock should open and close freely without excessive force, one that's seized or hard to operate needs attention before it becomes a problem you can't easily fix in an emergency. Check thru-hulls and seacocks during every haul-out, since these are not parts to discover are failing while still in the water.
What This Category Covers
Thru-hulls, seacocks, and strainers at CritPro includes bronze and composite thru-hull fittings, seacocks and ball valves, raw water strainers, and related hose barbs and hardware. Whether you are replacing an aging seacock or building out new below-the-waterline plumbing, this category covers what keeps water where it belongs.
Pairing Thru-Hulls with Other Boating Equipment
Thru-hulls and seacocks work directly with your boat's bilge and water pumps, and it's worth inspecting both systems together since they're often connected to the same intake or discharge line. Our full boating selection covers everything else needed to outfit the rest of the boat.
Browse the full thru-hulls, seacocks, and strainers selection at CritPro, or explore all boating gear to keep your boat solid below the waterline.