2020 Hawk had pressure issues at exterior shower. Also had air entering water pump. Removed lines from brass fitting going to quick connect. Looks like one of the plastic valves in the "y" shaped fitting that attaches to hot water line is broken. Likely allowing backflow of air. Can I purchase just this fitting or must I get an entire new box? See brass portion in pic attached. I have searched WTW without success. Appreciate the help.