Some more photos:
This in-wall tank has an access panel in the front and all internals are accessible. However, the input port is supposed to have a permanent connection. I just need to find a replacement valve that will work or a connection that fits.
This is the underside of the input port. It has a shutoff valve.:
The complete input Port removed from tank:
Included was an additional valve (chrome) that goes to nothing and is possibly a replacement for the pre-installed valve. Nothing that I have screws onto the chrome valve and I am assuming it is to be used if I were in a foreign country with different sizing.
View from above with valve removed:
