Leviton FDBX1-Y FD Box, Single-Gang, 26.0 Cubic Inch Capacity, 1-Inch NPT Openings, Includes Plugs and Stainless Steel Device Mounting Plate, Yellow Rigid PVC construction provides excellent resistance to impact, water and chemicals found in harsh industrial environments Boxes feature 1-Inch diameter NPT unthreaded openings, with Reducers for 3/4-Inch and 1/2-Inch conduit and plugs for unused openings Stainless steel device mounting plate with attached ground wire facilitates mounting of single receptacles and toggle switches Stainless steel assembly screws provide excellent corrosion resistance Corrosion-resistant brass threaded inserts for mounting covers