Water eliminators absorb water out of petroleum products. Simply drop the unit into your tank bottom, secure the lanyard to the fill cap or other convenient place. The crystals in the unit will swell when absorbing water in the tank. The water eliminator will have reached full capacity when the water retaining crystals have filled the entire unit. The lanyard facilitates easy removal of the saturated eliminator, leaving you with dry fuel. The WE-2 Water Eliminator is 8" (204 mm)long and come two per package and include lanyards. It is made of plastic and the whole unit is disposable. Each unit absorbs 4 oz. (120 ml) of water.