As the seat fixes back to the wall and not directly onto the W.C. it is not suitable for close-coupled suites.

Thunderboxes are made to a standard measurement for ducted "back to wall" W.C's (see dimensions), however it is always as well to check as we will adjust your seat as required, also be sure the flush lever does not interfere with the lid when lifted. The standard measurement is shown for the extended seat for exposed (high or low level) cisterns, but it is important to check this, as there can be quite a lot of variation and we will always make this to your requirement.