Well, the next gremlin has appeared. Actually, been around a while, but I assumed I was hooked to low-pressure systems. I just finished 5,000 miles and 10+ different RV parks. The pressure in my rig was ALWAYS terribly low. My wife just used the on-board pump and drained the tank. And, I always thought the tank took too long to refill. Google led me to articles that all suggested the screen and/or the pressure regulator. I ordered a new pressure regulator from Amazon and some screens. When I removed the old pressure regulator, it looked fine (screen was clear) and water flowed like a river when attached to my house. The new one did not flow any differently. Yikes, what's blocking it up? Just a trickle comes out of our plumbing unless we run the pump. I pulled the 90 degree next and can see something inside the line going into the rig, i am guessing it is a check valve. I pulled it lightly with my fingers but it did not come out....