Thank you for all the information! The existing house and the addition to it are conventionally plumbed with Pex and no manifolds. There does seem to be quite a few 90 degree connections in the new work where maybe some could have been avoided, but who knows. The question about low water flow came from the two new hose bibs that are connected and functioning. There are three new bathroom fixtures in the addition yet to be connected with unknown flow that I am also concerned about since once covered the fix could be very expensive. The rough plumbing was recently passed by city inspection. Is anyone aware that the 1/2" Pex is not allowed by the UPC in my situation? Is the 3/4" a recommendation, or a code requirement? Thanks again for the education!