The best of the bunch, though the painted finish is not smooth and will have to be modified. The metal inlets are much more substantial than the plastic and would seem to withstand wear and tear better.
honestly, these are ok, but my preference is the port with the full front cover but they are difficult to find in chrome. They last much longer than the inset cover. I am facilities manager at a large vet specialty hospital and the ports get a lot of abuse. The others hold up much better.