I don't know what brand of bidet you have, but most are srewed to the floor.
The trap can come from the wall or from the floor.
If you use a 1.5" trap, you may need the 1.5"x1.25" reducer. I believe most of the bidets use a 1.25" tailpiece.
Toto bidet seat
http://www.totousa.com/admin/upload/pdfspc/bt500ab.pdf





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