IP 68 or better Washdown EStop?

I would recommend the sealed capacitive touch guard style
http://www.rockfordsystems.com/online/pbfs/standardpalmbuttons.cfm

Or what I have done (being a cheap ***) is take an inductive prox and depending on application use orange safety pull cord that pulls a metal target away from sensor. (no matter what you need a SIL II or SIL III safety relay (like allen bradley AB guardmaster, or phoenix contact etc.)
 

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