I agree! I installed the ST416M tank on the CT416 bowl and Washlet and the 7/8 female 7/8male is mandatory. Not referenced in either set of directions. Unfortunately not available where I live and it was the 4th of July weekend coming up. It was a long trek to the other john at night for a while. But we love the new TOTO. LOL
The part is a THU9090 by TOTO





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