The TVF-N20YNMM00000N003 is a TopWorx valve position switchbox with a tropicalised aluminium base and a clear resin lid. It is rated intrinsically safe.
Position sensing is by NAMUR switches. The switchbox has a 90° visual indicator showing yellow for open and black for closed, a NAMUR 316 stainless steel shaft, two M20 conduit entries and silicone O-rings.