what is the difference between these two fuel pressure regulators? Part# 12575013 and Part# 19245530. They look the same. Big price difference. ( Fritz Nueesch, 12/16/2019 )

Part # 12575013 is not a pressure regulator, it is just a pulse dampener as the fuel system it is used on (2004+) is actually regulated at the fuel pump, not the rail.