uxcell 5 Pcs Blue Plastic Air Pump Outlet Check Valves for Aquarium Tank</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>used for water treatment， air purification， auto parts， industrial machinery， household appliances</li><li>Good quality material， safe and nontoxic.</li><li>Stable characteristics， high reliability.</li><li>Easy installation and replacement.</li><li>Arrow marked on valve， showing fluid flow direction</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41nt0rcZvHL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41hxWfxJZqL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31s5ApiMRFL.jpg' noproxy></br>