We have a RO system that decided to quit working. All filters have been recently replaced. The pressure in the tank reads good. We replaced the membrane, since that has been a problem before. RO still not working, and we have leaks at the tee push to connect fittings. Replaced the fittings, and still have leaks. ?? My husband then tried to bypass the RO system and connect the cold water line to the fridge line directly......still leaks at the 2 ended (not a tee) push to connect fitting. Why are we getting these leaks? If we can't fix the RO system we're tossing it. But we are still getting leaks trying to connect the cold water plastic tubing to the fridge plastic tubing, at the newly purchased fitting. And yes, they are all the same size (3/8") Help!!