Hello, I have a new to me Simpson belt drive 4200 machine. I need help identifying what the two ports on the far right are. I would have thought one is a bypass to run to a buffer tank but I am not sure which either of these are. One is stamped OUT (the top port) and IN. The IN port has a plastic plug and the OUT has a brass plug.
Ultimately I am just trying to determine which one to use as a bypass.