A process instrument mount includes an outer wall and an inner wall. The outer wall is separated from the inner wall by a space. The mount has a first end and a second end, and a hole extends from the first end to the second end. The inner wall surrounds the hole, and has a threaded region to receive a process instrument from the first end. The inner wall also has a flange proximate the second end to sealingly mate with the process instrument. In one embodiment the inner and outer walls are portions of a unitary metal block, and the space separating them comprises a groove formed in the metal. In another embodiment the inner and outer walls are separate parts joined together at the second end and spaced apart between the first and second ends.