Old Style Designer Cover used on Fleck 1500, 2500, 2510, 2700, 2750, 2850, 2900, 9000 , 9100 and 9500 Valves.PN 60232-110 or some manuals list 19291-020This cover is held to the steel back plate by two thumb screws ( one on either side of the cover ).Thumb screws NOT included.The width is 10" at top and bottom but flanges out to 11" wide about a 1/4 of the way up from the bottom.