Most residential toilets are gravity-fed models, which use a totally different method of sending the water from the tank to the bowl than pressure-assisted toilets use. A pressure-assist toilet forces the water out of the tank with greater force. Presently, it is not possible to mold the pressure-assist technology with your current gravity toilet.
The main reason a traditional gravity toilet cannot be converted into a pressure-assist toilet is that the two technologies use differently engineered bowl. The passageways from the tank to the bowl and the bowl's rim holes on a gravity toilet are designed to properly transport the water dropping down from the tank. The bowl of a pressure-assist toilet is engineered to accept water that is forced down with much greater pressure.
The tanks of pressure-assist toilets are specially designed for the pressure-assist units that both contain and force the water down into the bowl. The tanks of gravity toilets are designed for different components. These two tank designs are not interchangeable. In a gravity toilet, the water is held within the toilet tank itself, unlike in a pressure-assist model, which contains a smaller tank within the outer toilet tank.
The Flushing Components
A gravity toilet uses a fill valve, that comes on when the toilet is flushed and the tank water level drops past a certain point. When the water level reaches a predetermined level, it shuts off. A flush valve usually operates by opening a flapper, which allows the tank water to simply flow out of the tank. The power of gravity, along with the volume of water inside the tank, propels the power of the flush. The pressure-assist toilet works quite differently. The pressure from the toilet's water supply line compresses the trapped air in the smaller tank within the toilet tank. This compressed air then forces the water down into the bowl.
The only way to change the flushing components in a toilet tank with pressure-assist components is if the toilet is already a pressure-assist toilet. In this scenario, Flushmate offers a change-out kit, which allows you to upgrade the flushing system in your toilet to have Flushmate pressure-assist components. This change-out kit works only on a specific selection of tanks from other pressure-assist toilets. According to Flushmate, its pressure-assist system cannot be retrofitted into a standard, gravity-fed toilet.