This 3-gallon bladder tank is designed to store reverse osmosis (RO) water for drinking water purposes.  The RO system fills this device through the top fitting, and later exits that same port to feed a spigot or the icemaker of your refrigerator. 

Featured Upgrade: Water on demand is served up with a pressurized bladder tank.
Do not feed this tank's RO water into the DI stage because limited contact time would affect results.
Holds 3-gallons of water
Lower fitting is to add air to pressurize the rubber bladder (6-10lbs)