Watts-FWRO80 Flexwave Composite Tank for RO Storage, 24.2"x 64.10", 80 Gallon Capacity, 1.25"NPTWatts FWRO80 Composite RO Tank 80 Gallon Flexwave Storage Tank for High Capacity Reverse Osmosis Systems Lightweight composite construction with oversized diaphragm for 20 30% more capacity than standard steel tanks 80 Gallon Capacity 1. 25" NPT Connection 125 PSI Max Non Corrosive The Watts FWRO80 Flexwave composite tank solves the weight and corrosion problems of traditional steel accumulator tanks while delivering higher usable capacity through its