Amazing toilet design performance. Just purchase one complete unit and it flushes quick and easily. I dont have to flush it twice or more like my previous low fllush toilet. I think its the hydraulic design of the unit, the 2" diameter, height and slope of the trapway, and a slight slope upwards just before it goes down the drain pipe controls the flow velocity, therefore the trapway is flowing full and the siphon action of the flush is continous towards the drain."..." Read more
- Ed in Calgary, Alberta,Canada