The TVH-K20GNMM is a TopWorx valve position switchbox with a 316 stainless steel base and lid. It is rated intrinsically safe.
Position sensing is by two mechanical SPDT switches with gold contacts. The switchbox has a standard 90° visual indicator showing green for open and red for closed, a NAMUR 316 stainless steel shaft, two M20 conduit entries and silicone O-rings.