Intermatic WP3100C Flexi-Guard Series Single Gang Weatherproof While-In-Use Cover Flexi-guard(tm), Weatherproof Receptacle Cover Mounts Vertical Or Horizontal 2" Standard Depth Includes 3 Patented Inserts Clear Technical Details - Single gang NEMA 3R receptacle cover - Compliance with 2008 NEC Article 406.8 (B) (1) - Compliance with 1999 NEC Article 410-57(b) and NEC Article 210-60(b) - Designed to mount vertically or horizontally - Patented insert design http://www.kingbuybest.co.cc/Buy-Intermatic_WP3100C_Flexi_Guard_Series_Single_Gang_Weatherproof_While_In_Use_Cover-B001PKP4J6.html