Perko Engine Flushes

Perko Flush Pro™: The Smart Way to Flush Your Inboard Engine

When it comes to protecting a marine inboard engine from the corrosive damage of saltwater, sediment, and mineral deposits, few solutions are as well-engineered as Perko's purpose-built engine flush products. The centerpiece of Perko's offering in this category is the Flush Pro™ valve system — a permanently installed, in-line flushing solution that takes the hassle and guesswork out of routine engine maintenance.

How the Flush Pro™ Works

The Flush Pro™ installs directly in-line with the hose leading to your boat's impeller pump, becoming a permanent part of your engine's cooling circuit. When it's time to flush, there's no need to haul the boat or set up awkward flushing muffs. Engine flushing becomes as straightforward as removing the Flush Pro™ cap and threading on a standard garden hose.

Once water pressure is applied, the system's intelligent double-valve design takes over automatically. The check valve — built with a stainless steel spring for long-term durability — activates under water pressure from the hose, simultaneously shutting off the hull intake and routing fresh water through the entire cooling system. This means the flush works correctly whether the boat is on a trailer or still sitting in the water. When the hose is disconnected, the valve closes automatically, preventing any unwanted water ingress into the hull.

One standout feature is the valve's transparent polymer body, which allows boaters to visually confirm that water is flowing properly through the system — a simple but meaningful quality-of-life detail that removes uncertainty from the process.

Winterizing Made Easy

The Flush Pro™ system doubles as a winterizing tool, which is where it really earns its keep. After draining the cooling system, the Flush Pro™ cap is replaced with a winterizing fitting that accepts a standard 5/8" tube. The engine draws antifreeze directly from a bucket, circulating it through the cooling passages until the system is protected against freezing temperatures — no improvised setups required. The Flush Pro™ is also compatible with onboard generators, extending its utility beyond the main propulsion engine.

For boaters who want the complete setup from day one, the Flush Pro™ Kit includes the valve itself, seven feet of hose, and all necessary hose fittings and clamps — everything needed for a clean, permanent installation.

Why Perko for Engine Flushing?

Perko has been manufacturing marine hardware in the USA since 1907, growing from a small Brooklyn lamp-making operation into a family-owned company with over 425,000 square feet of manufacturing capacity in Miami, Florida. Critically, Flush Pro™ valves are made in the USA, using American-sourced raw materials — a hallmark of Perko's manufacturing philosophy that sets them apart from many competitors. For boaters who trust the longevity of their engine to a single valve, that provenance matters. Explore all available engine flush options or browse the full Perko catalog to find the right fit for your vessel.