The BB-1000 and BB-800 electronic bidet toilet seats are designed to be installed on standard Round / Oval / D-shape toilet pans that meet the dimensions on the drawing shown below.

The dimension 490 mm should be a flat surface all the way. The seat fixing holes in the pan should be through holes. Access is required to the underside of the pan to tighten the fixing nuts.
If the seat fixing holes are blind (top fixing) with no access to the underside of the pan, please contact us for advice.

If you have any doubt about the suitability of the Bio Bidet for your toilet, please contact us for advice.