FERRODAY is aimed at creating a wonderful shop of home brewing, we have many products about home brewing, <br>get more products by searching FERRODAY on Amazon!<br><br> 【Product Features】:<br> 1. the easy to fit 5/16" barbed connections.<br> 2. Filters down to 0.5 micron at 99.99% efficiency.<br> 3. Perfect for aeration or oxygenation systems. <br><br> 【Please Note】:<br> 1. Labeled with “in” and “out” on the end of the filter for proper identification of direction, please keep the <br>air flow going in one direction when using it.<br> 2. Discard if there is any signs of discolor.<br><br> 【Life Time Service】: We are committed to offer you high quality product as well as superior service! <br> 【Lifetime Technical Support】: Please feel free to tell if anyroblem, we would try our best to help!<br><br> 【Package】: 4 PCS Air Filter