GUARDIAN G1540BAR Guardian AquaGuard Gravity-Flow Eye Wash RefillsGUARDIAN 333 G1540BA R Features AquaGuard Gravity Flow Eye Wash Refill Bacteriostatic additive refill Eyewash unit should be inspected regularly and water in unit should be changed at least once every six months One 8 oz bottle will preserve up to 20 gallons of potable water for up to six monthsAdditional Details Capacity Vol. [Nom] : 8 oz Packing Type : Bottle Type : Eyesaline Solution Wt. : 2 lb