
The recommended replacement is 550-0621B.
Replaces: 550-0231 , 550-0231B , 550-0621B , 631422 , 806105286802 , WWP-051-0231
Due to the manufacture changing the design of the tank, there is a fitment issue when trying to mate the old bottom (550-0201) to the new tops 550-0611 (75 & 100 sqft), 550-0621 (125 & 150 sqft), 550-0631 (175 & 200 sqft). It is recommended that you replace the bottom when replacing the top. Tank Body 550-0601 is discontinued.