My girlfriend has an Oxygenics Shower Wand and it is leaking from the hose connection to the plastic swivel fitting mounted to the stem pipe. The hot water feed is from an instant water heater and has very low flow. I have tried unsuccessfully to increase the flow but the flow screw popped out and leaked water all over the place (whatever genius did not install shut off valves near the unit), but that is another story. Anyway, low flow hot, lots of pressure from the cold water line. When the hot water is on it leaks from said connection, however, when you increase the pressure with the cold water the leak stops, problem is now you have a cold shower. Any ideas on a fix for the leak?