I have a 2005 Monaco Diplomat with an Atwood W/H. After reading comments on the check valve problems I believe I have a similar problem. Good cold water pressure at all outlets and inconsistent pressure, sometimes not at all, for hot water. I have looked at the back of my W/H and easily see the outlet check valve at the top behind the bypass valving. I do not see a similar check valve at the inlet at the bottom right. I only see a 90 degree brass fitting. Am I missing something or could the inlet check valve be in this brass fitting? Will replacing the outlet check valve at the top fix my problem? Thanks for any information. Don