There is only one sewer, how to install the toilet?

Now there are two pits in the toilet because the distance between the sewer and the wall of the house is uneven, that is, the pit spacing as the saying goes. The pit spacing between two holes should be 30CM and 40CM. Just measure the pit spacing at home and block the other pit, which has no effect on the use.

One hole and two holes are the same. Two holes can be selected during installation. For two holes, the distances are 300 and 400 (mm) respectively. It doesn't really matter whether it's one or two. Mainly depends on its suction.