KOHLER K-18829-NA 2" x 4" In-Wall Toilet Tank and Carrier System Insulated tank to prevent sweating Large flush actuator plate opening can be removed for easy access to the inner tank Adjustable height allowing the bowl to be set anywhere from 15-3/8 inches to 28-1/2 inches from floor Works with k-6299 bowl as well as k-4177 and k-8857 flush actuator plates to create a complete solution Dual-flush technology allows you to choose between a full 1.6 gpf- or partial 0.8 gpf-flush