Older or basic toilets are round, the inside of the toilet bowl is usually about 11 inches around. More modern or deluxe toilets have an elongated bowl that is about 2 inches longer than it is. it's a noticeable difference. If you're still wondering, you can measure from the two mounting bolts at the seat hinge to the very front of the toilet bowl. That measurement will be about 16 1/2 inches if the bowl is round, and 18 1/2 inches if your bowl is elongated.
1pc toilet is a sculpted into a seamless unit, and has no crevices between the tank and bowl.
2pc toilet is one that has a separate tank and bowl which are bolted together upon installation.
Bio Bidet products are designed to fit almost all 1and 2pc toilets. However, there are some exceptions such as category "C" below,
If you have a 1pc toilet with a deep French curve, please contac t us with the make and model of your toilet for a compatibility check.