I am currently restoring 2 1994 Polaris SL 750 pwc's. I noticed in the rear on the right of the propeller there is a hole on both of them. I assumed that this is where the hose fitting was for the cooling system. I have an intent to use them in brackish water. There is no hoses on the inside that are loose or have no ends, so it makes me think that there never was one, but I am still confused because the battery is directly on the inside of the hole, so im not sure whether i should invest in a new hose fitting or just plug it up if that is possible? and where should i start for both.