Grate - 13, SVCE (OG54,OG42,OG30)
  NOTE:   This is a Cylindrical Grate, For Hex
          Grate See 814536
  OG30    Uses Two 13" Grates
  OG36    Uses Three 11" Grates
  OG42    Uses One 12" and Two 13" Grates
  OG54    Uses Two 12" and Two 13" Grates