... price 2013 factory manufacture Explosion Proof Corrosion Proof Control Unit Application: 1, Designed for Zone 1 and Zone ... ,Built-in explosion proof button with special cementing treatment to ensure reliable cementing.6,Built-in explosion proof indicator and ... ,Ingress protection:IP658,Corrosion resistance:WF29,Product form: Control unit Electrical hoist button:Ingress thread specification : G3/4" ...