I have a 2003 4-stroke Honda 9.9 outboard. I want to buy the fresh water flush adapter. I have a question. Does the Honda adapter stay in the threaded opening on the engine all the time, or do you have to take the cover off and screw the adapter in each time you flush? If it stays in, do you have to remove the engine cover each time you flush or does it extend through an opening through the cover. I've seen Yamaha outboards that have a garden hose fitting outside the cover and makes it very easy to flush. Is the 9.9 Honda adapter as easy? Thanks, BrianW