Scoop & Round Strainers

What Are Scoop & Round Strainers?

Scoop and round strainers are essential hull-mounted fittings that serve as your vessel's first line of defense against the debris-filled world beneath the waterline. Installed at thru-hull openings, these external strainers intercept seaweed, marine growth, sticks, and other material before any of it can reach your engine's raw water cooling circuit, livewell pumps, air conditioning systems, or bilge equipment. The difference between a clogged strainer and a clear one can mean the difference between an afternoon on the water and an expensive tow back to the marina.

Scoop vs. Round: Choosing the Right Style

Scoop strainers use a directional clamshell or scoop-shaped screen to ram water into the intake as the vessel moves forward — making them well-suited for powerboats and motoryachts where forward momentum assists the flow of raw water into the cooling system. Round strainers, on the other hand, are non-directional and draw water from all sides equally, making them the preferred choice for sailboats, slower vessels, and stationary applications such as bilge pump intakes where there is no consistent direction of travel to assist intake flow.

Installation orientation matters enormously. On a sailboat, a forward-facing scoop strainer can force water over a siphon break and introduce flooding risks — a round strainer eliminates this concern entirely. When choosing between styles, consider your typical speed, hull type, and the specific system the strainer will serve.

Materials and Maintenance

Strainers are available in bronze, stainless steel, and advanced engineering polymers. Each material has trade-offs: bronze offers time-tested durability but adds weight and requires bonding to prevent galvanic corrosion; stainless steel resists corrosion but can still be subject to crevice corrosion in stagnant saltwater; modern polymer compounds offer lightweight, truly corrosion-free performance that doesn't require bonding and can be painted over with antifouling bottom paint. Regular inspection and cleaning are critical — even the best strainer becomes a liability if allowed to clog with barnacles or marine growth.

Top Brands in Scoop & Round Strainers

Forespar is one of the most respected names in marine plumbing hardware. Their scoop and thru-hull strainers are precision-molded from Marelon®, a glass-reinforced polymer that is the only synthetic material approved by Underwriters Laboratories for use below the waterline — passing the same stringent tests as bronze. Marelon resists corrosion, electrolysis, and temperature extremes, and Forespar's two-piece scoop strainer construction makes installation and screen replacement straightforward.

Xylem-Bell & Gossett brings deep engineering expertise from the broader world of industrial fluid handling to marine and RV plumbing applications. As a leading manufacturer of pumps, valves, heat exchangers, and fluid system accessories, Bell & Gossett's strainer products reflect a commitment to precision engineering and reliable performance across demanding water management environments.