An anti-piracy system for a vessel produces a non-lethal all of water along the side of the vessel to wash away a pirate. A cylindrical cap has a top, a bottom edge, a hollow interior, and an outside surface. A slit is defined within the outside surface forming a partial opening within the cap from the interior to the outside surface. A threaded hose fitting is formed within the interior, wherein the cap can be secured to a fire suppression node on the vessel with the downward face positioned over a side of the vessel for forcibly dispersing water through the slit downward over the side of the vessel. The cap is positioned near the deck of the vessel, just over the side of the vessel such that upon activation of the tire suppression system the water is directed downward over the side of the vessel.