Sherwood Pump Sea Strainers

Sherwood Pump Sea Strainers: Protecting Your Marine Engine from Debris

When raw water enters your vessel's cooling system, it brings with it the full contents of the sea — grit, weed, sand, and debris that can quickly damage impellers, pumps, and heat exchangers downstream. Sherwood Pump, a brand with a marine engineering heritage stretching back to the early 20th century, has long understood this challenge. Their line of sea strainers is purpose-built to intercept that debris before it ever reaches critical components, keeping engines, generators, and washdown systems running at their best.

A Heritage Brand Built on Marine Expertise

Sherwood Pump's credentials in the marine world are hard to overstate. The brand's history goes back to the early 20th century, when its founder expanded a plumbing business into a foundry and machine shop. By the 1920s, Chris-Craft incorporated Sherwood into the first inboard-powered yachts, technically developing the first seawater pumps for marine engines. That depth of raw-water system knowledge informs every sea strainer Sherwood makes today.

What Makes Sherwood Sea Strainers Stand Out

Sherwood sea strainers are engineered with the same design priorities that define the brand's pump lineup: durability, flow efficiency, and ease of maintenance. Key features across the lineup include:

• Full-flow filtering at ultra-low pressure differential — strainers deliver full flow of liquid while providing effective filtration of foreign matter in the supply line, ensuring no loss of cooling capacity.
• Non-corrosive construction — thanks to their non-corrosive construction, Sherwood strainers serve for a long period of time even in demanding saltwater environments.
• Stainless steel screens — the stainless steel screen provides a large ratio of screen area to port size, maximizing debris capture while maintaining strong flow rates.
• Clear bowl for quick inspection — the transparent bowl lets boaters check strainer condition at a glance without tools or disassembly.
• Easy inline cleaning — cleaning is accomplished easily without removing the strainer from lines, making routine maintenance fast and straightforward.
• Multiple port sizes — Sherwood offers strainers in 1/2" NPT, 1" NPT, and 1-1/4" NPT configurations to suit a wide range of vessel plumbing setups.

Where Sherwood Sea Strainers Are Used

Sherwood sea strainers are designed to filter engine cooling water, washdown pump, genset, or saltwater galley pump intakes — essentially any raw-water intake circuit where debris protection is critical. Whether you're protecting a main propulsion engine, an auxiliary generator, or an air-conditioning system, there's a Sherwood strainer sized for the job. Replacement screens, O-rings, and clear bowls are also available as separate service parts, so maintaining your strainer over the long haul is just as straightforward as the original installation.

Choosing the Right Sherwood Sea Strainer

The most important selection criteria are port size and mesh specification. Sherwood's 20-mesh stainless steel screen is the standard choice for most raw-water intake applications, offering a balance between debris capture and flow volume. Match the port size (NPT thread) to your existing through-hull or seacock fitting, and consider the optional mounting bracket if you need a secure, vibration-resistant installation location in the engine room. Browse the full sea strainers category or explore the complete Sherwood Pump catalog to find the right fit for your vessel.