I have just completed a full master bath renovation which included a new shower, bathtub, and sinks. Once the shower and bath portion of the project was complete, all worked well, but once my sub-contractor finished the sinks, I get a rattling noise in the wall when I turn either the hot or cold water on. I also hear it again once I shut these faucets down. I also noticed that when I turn the bath on (or off) the noise is a bit louder. I have been informed that there is air in the lines, which will clear over time. I also have been told that there is no immediate remedy for this. Any suggestions?