A corrosion test cabinet 10 featuring a test chamber 12 defined by at least one wall 16, a movable member 18 inside the chamber 12 and a drive source 20 outside the chamber. A coupling 22 conveys drive from the drive source 20 to the movable member 18 through the wall 16 of the test chamber and where the coupling comprises at least one magnet 24 to create a magnetic coupling through the wall 16, without breaching the wall 16. Optionally, there is a driven member 38 positioned outside the chamber, driven by the drive source 20 and a driven member 34 positioned inside the chamber driving the movable member. The driving 38 and driven member 34 may both include one magnet 24 or a ring of magnets which may be coaxial with the turning axis of the member 18. Optionally, the movable member 18 features at least one spray head for dispensing corrosive material.
