Crosstex Safe-Flo Saliva Ejector/Valve Sample Set, 3 Packages. Sharing is not always caring, haha. Stop evacuation line back flow in its tracks and reduce the risk of cross contamination from patient to patient. Includes 3 sample packs. Sample packs each include 2 Safe-Flo Saliva Ejectors, fully assembled with Safe-Flo Valve; replaces your current saliva ejector, and a Safe-Flo SE Valve to use with your favorite saliva ejector brand. Sample bags are brand new and have not been opened or tampered with. Shipped USPS First Class.