Yamaha's Conduction Assembly (67X-E2590-00-00) is the quick-attach flush fitting every jet-drive owner should have in the dock box. Cast from tough, glass-filled nylon and molded with eight deep grip ribs, it threads on easily-even with wet hands-then seals tight against the factory port thanks to its twin O-ring barbed spigot. Snap in a garden-hose adapter, crack the faucet, and raw water scours salt, sand, and silt from the cooling jackets before they can hard-bake into corrosion. The result? A cooler-running engine, fewer scale-clogged passages, and more worry-free hours chasing wake.. Why this little fitting earns its keep:. Rugged composite body resists UV fade, impact, and fuel splash better than cheap aftermarket clones.. Tall ribs double as knuckle guards, making it easy to loosen without pliers.. Precision-machined barbs and locator pin align perfectly with Yamaha flush ports-no leaks, no guessing.. Fits a huge model list, from early GP and FX WaveRunners to modern AR and 242