Anyone use this? Thinking about using it to ferment with, then when its time to cold crash I will just push the button and turn it into a solid stopper. Hit link.
http://morebeer.com/view_product/10937/102272/Premium_Breathable_Silicone_Carboy_Hood<br__>
http://morebeer.com/view_product/10937/102272/Premium_Breathable_Silicone_Carboy_Hood<br__>