The blue manifold can be pulled away from the wall at the top. This will let it rotate forward so that the manifold can lift up and out. Once that is out of the way, there are metal clips at the center and the top of the water supply tube (if there are not mounting screws) that can be gently pried away from the lock tabs on the tube. Starting at the top, once the clips are moved and the water tube is moved out from them, the entire manifold from the sump to the water tube should be able to be rotated and removed.