The Boat Trix Outboard Quick Connect Flush Kit with Multi Function Washdown Sprayer Bonus Combo is a 100% fit on Yamaha and Honda Outboard Engines. This kit is all you need for flushing single engines, All the components are assembled, tested, and proven leakproof at our facility in Bradenton, Florida. The materials are UV resistant and durable. The Dock Hose Valve and Quick Connect Assembly makes it super easy to switch between Flushing your engine and washing down your boat. This assembly will save you time at the dock and the Dock Hose Valve save you trips to the spigot because you can shut off the water flow at the hose end.. If you have doubles, triples or quads, simply buy additional engine quick connect fittings from our Amazon store. The Combo kit. includes bonus components like our dock hose valve, quick connect fitting and our Multi-Function Boat Washdown sprayer. If you have multiple engines look for out Twin Flush Kit also here on Amazon.