Perko Sea Strainers

Perko Sea Strainers: Dependable Raw Water Protection for Your Engine

When it comes to protecting an inboard engine's raw water cooling system, few names carry more weight than Perko. Perko has been manufacturing marine hardware in the United States for well over a century, and their sea strainer lineup reflects that deep institutional knowledge. Browse the full selection of sea strainers to find the right model for your vessel's plumbing configuration.

Why Perko Sea Strainers Stand Out

Perko's approach to sea strainer design centers on three priorities: maximum flow, minimum corrosion, and effortless maintenance. Every strainer in the lineup is built around a 316 stainless steel basket, chosen specifically to minimize electrolysis in saltwater environments. The basket features a screen hole diameter of 0.079 inches, delivering a 47% open area — a figure that Perko notes is among the highest in the industry for cylindrical strainer baskets.

Construction throughout the line relies on cast bronze bodies, a material Perko has refined over generations. In fact, Perko is recognized as the only domestic marine manufacturer producing die-cast bronze parts, well known for strength, uniformity, and consistency across production runs. That means every strainer body, cover, and fitting meets the same exacting standard.

The Perko Sea Strainer Product Lineup

Perko offers several distinct sea strainer models suited to different vessel sizes and flow requirements:

• 0493 Series Intake Water Strainer — The workhorse of the lineup, designed for easy installation with mounting lugs cast into both sides for universal fitting. A hinged-lug bronze cover allows quick removal and cleaning of the basket, and a drain plug in the bottom casting makes sediment removal and winterization straightforward. Higher-capacity installations can step up to the companion Fig. 0500 model.
• 0443 Lightweight Intake Water Strainer — Perko's lightest option, constructed from cast bronze with a clear polymer body for a visual check on debris accumulation without opening the unit. Ideal where weight and visibility are a priority.
• 0693 Large Boat Strainer — Engineered for bigger vessels with greater cooling demands. Aircraft-style captive mounting nuts cannot be dropped or lost during service, and a top-cover handle provides quick access to the basket. A transparent cylinder allows visual inspection of debris buildup between cleanings.
• Flushing Strainers — A specialized variant featuring four outside tie rods and the same 316 SS basket, designed for installations that require periodic flushing as part of routine maintenance.

Built for the Long Haul

Perko backs the entire sea strainer range with a comprehensive selection of spare parts — including cork and rubber gasket kits in multiple sizes — ensuring that long-term ownership is cost-effective and hassle-free. Because Perko is a fully vertically integrated manufacturer, replacement parts are produced to the same specifications as the original hardware, making maintenance predictable across the life of the strainer.

Whether you are fitting out a new build, replacing an aging unit, or simply upgrading to a strainer with better flow characteristics, Perko's sea strainer line offers a proven, American-made solution backed by more than a century of marine engineering expertise. Explore the complete sea strainers category or learn more about the full depth of Perko's catalog on the Perko brand page.