I flushed my former boat - a Yamaha (ok, poor choice of words) each time I used it and the valve wasn't tough to get at, right under the seat. I see the SeaDoo valves are by the impeller/nozzle and if I sport-port the boat it looks like I'm going into the drink to get at it. My use is primarily salt water so is it suggested I flush this thing after every use or is the benefit of the "closed loop cooling system" one that I don't have to flush?

I do agree that a good coating anti-corrosion spray would be a good idea, salt air kills everything except greenhead flies.