I was told by a friend that volvo penta has some sort of system that can flush the cooling system when the boat is moored. He didnt know much about it, nor do i, just that it exists. My manifolds and risers were fine for 10 years but once I finally got a mooring, my manifolds rusted through. I'd like to keep my new manifold/risers for just as long, so I need a way to flush while on the water. So heres my question: Anyone use or know this volvo flushing system? How does it work? Thanks!