What to do when the brand new stuff you are putting in needs to work along with...
So that's why the whole building is rotting away... for brine feed ...
It controls some valves for brine feed to four overgrown water softeners. Of course there is more to the entire mess, but this is a shining example of the type of thing encountered in water treatment as a couple others have noted here. NEMA 12 may be what the customer wants, but even if it is not a washdown application, 4X still has a place!