https://www.mccoys.com/shop/p/0043968-052303-36/tpi-4300pw-wallplate-adapter-white
Adapter plate allows replacement of all CB Series and MW Series heaters. Opening 14-3/4 in x 6-3/4 in. Overall 21-1/2 in x 12-1/4 in.
Color
White
Dimensions
12-1/4 in ID x 21-1/2 in OD
Suitable for
Bath Heaters