Contender CPS Factory Sealed 20 A Pin and Sleeve Receptacles provide explosionproof protection for stationary or portable equipment in hazardous, damp or corrosive locations. It features delayed action construction; to operate, insert plug to first stop, move Slide-Lok slide to the right and push plug fully forward to energize. The Contender CPS meets all UL and CSA requirements for ground fault protection in hazardous locations when the GFCI cover is used.