Our sealed rings are easy to use</br>?Makes fermenting leak free.</br>?Diameter of Rings: Big ring diameter is 30cm??Small ring diameter is 20cm</br>?Applicability: The big sealed rings can be used for 5 gal moonshine still Stainless steel boiler with 11.8 inch diameter ;The small sealed rings can be used for the small copper cooler with 7.5 inch diameter.</br>?Package include: 2 big rings or 2 small rings. You can order them just as you need</br></br>Product Description</br></br><br>Our sealed rings will make it more convenient in the process of distilling.They are easy to use and very safe.<br><br><b>Measurements:</b><br><br>The small rings diameter is 20cm<br>The big ring diameter is 30cm<br><br><b>Package include: </b><br><br>2 x small rings <b>Or</b> 2 x big rings</br><br/>http://www.amazon.com/gp/product/B01N8PA8Q8