CM Stopper #00 3/8" BPA-Free Food Grade Clear Silicone Rubber Airlock (12ct)</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>3/8" inside diameter Grommet center hole is the standard size of Fermentation Airlocks</li><li>#00 Stopper inserts into 3/8" Grommet hole</li><li>BPA-free Food Grade Clear Silicone Rubber Stoppers</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/41yanSkkgpL.jpg' noproxy></br>