My noise is not originating from the check valve on top of the can.
I can hear the ball inside the valve doing it's thing,but that is not it.
As stated earlier, changing that check valve to a straight fitting makes no difference.
Again,it sounds like it is coming from inside the can and reverberating through the hoses.
Went out to the garage to listen again.
I'm wondering if the emulsion tube inside is coming loose now?
.........