[Al Skierkiewicz]

CC,
A few items you might want to address.
Please use only one output port on the regulator, plug the unused ports.
The photo you linked has one way valves. These are air piloted valves that you show and if you back feed them with pressure (as shown in the photo), they will leak. Another source of leaking with the manifold you show, is damaged gaskets. The gasket between the manifold and the valves must be placed correctly on the valve body and the valve must be tight to the manifold. If the gasket is not placed properly and if the valve is loose, it will leak through the gasket from one port to another.