Dometic/Sealand 510+ 4 bolt pattern traveler toilet comes in white and has multiple style options to best suit your RV toilet needs. This toilet features an improved rim wash, a deeper bowl, increased seat height, and a household-sized seat for maximum comfort. Standard height 18.75". Note: This RV toilet use a 4 bolt floor flange. If you intend on using the 510+ or 511+ toilet to replace a Thetford toilet with a 2 bolt floor flange, you will need to purchase a flange adapter. If you need help with what parts or toilet you need please call Environmental Marine at (1-800-522-2656).