OZ-Gedney Type PLG Internal Recessed Threaded Insert Plug, Size: 1 IN, Copper-Free Aluminum, Connection: Threaded NPT, Body Thick: 3/4 IN, 1/2 IN Socket Size, Third Party Certification: UL File Number E-34997 Suitable For Wet Locations, UL Listed For Hazardous Location Use As Follows: Class I, Division 1, 2, Groups A, B, C, D, Class I, Zone 1, 2, Groups IIA, IIB, IIC, Class II, Division 1, 2, Groups E, F, Glass III, CSA 009795, Applicable Third Party Standards: UL 886, CSA C22.2 Number 30, NEC Articles 500-503 & 505, For Outlet Boxes And Hubs