.... I have a 2004 rxp.. Don't confuse the flushing hose with the inner cooler hose.
It's the lower hose to the innercooler. In the rear port side coming from the jet pump. Sorry I do not have a picture, but Seadoo did put a red band around the hose. I had to download the 2005 manual to see it better. It was only when I pull out my supercharger that I could see it. You will need a skinny arm to reach the hose where the red band is located ( aft port/left side. The hose feeds the innercooler (coming from under the left-port side of the engine) then exits the cooler and goes to the exhaust manifold. If you can't find the intercooler, it has two hoses connecting to it on the forward starboard-right side of the engine. You can grab the hose coming out of the innercooler, then follow it around- shake it and see where the hose goes aft. Let me know of you find it.
I am planning to put in a brass ball value with oversize hose fittings (so I don't decrease flow) in the front area of the engine. I need to able to tow it behind a house boat.