Tier1 Comparable Reverse Osmosis 14 Gallon Bladder Tank - includes Tank Stand Certified by NSF/ANSI Standard 58 for material and structural integrity. 1/4 inch NPT connection at the top for a water line. 14 gallon tank, but the actual water capacity is slightly less due to the air pocket and bladder inside. Used to replace an existing RO tank, or added to a system to increase the capacity of stored product water Actual Size: 23 inches (height) x 15 inches (outside diameter)