1-Gang Weatherproof Cover for Flanged Devices, 2.25 Inch Diameter, FS/FD Box Mount, Industrial Grade, IP64, NEMA 3R, Vertical Self Closing Lid - GRAYFor Use With 3-, 4- or 5-Wire 20 Amp & 30 Amp Locking Flanged Inlets or Outlets, Ideal on Generators