My Titian II had some fine mesh screens at all the hose fittings. Untill I took them out it wouldnt pull a vacuum for ****
I did the same to the Titans I have. You had asked me before about how the JB manifold was working and like I said I have had no problems with it. If Lockhart had a 4 valve out then that is what I would be using as I need one. That manifold has had a lot of refrigerant through it hanging off of a reefer trailer.