AquaGuard Gravity-Flow Eye Wash, 16 galSelf contained gravity flow eye wash units use gravity to deliver water through dual spray heads Top operate unit, fill unit with clean potable water and add bacteriostatic additive (supplied with unit) Water flow is activated by pulling down on bright yellow eye wash tray Integral full flow nozzles deliver soft spray of water, swing tray up to storage position to stop flow Waste water is directed into drain opening in tank basin, 3 ft. long drain