1994 Yamaha Waverunner 3 (650 cc), has a hose with what appears to be a quick connect (reminds me of a hydraulic quick connect I see on tractors except it is plastic) for flushing. I bought a manual but it does not reference this connection or give a flushing procedure at all. I remember once someone told me that the motor needs to be running before the water is on to prevent flooding of the cylinders with water and I don't want that. What is the procedure and where might I find a connector/adapter for a water hose?