I just got a pontoon boat and it has an older 9.8 mercury on it. what I need to know is can I use the clamp on muffs that you hook a water hose up to and see if it will run and if so I am not sure where these muffs go there is 2 round holes but when I took the plastic caps off it looks like there is a solid cap with a c clamp. I would appreciate any help.