This yeast collection container fits the 27 and 55 Liter FermZillas and is primarily used for collection and addition of hops and yeast via the butterfly valve. This collection container can also be used for yeast starters meaning that you can create the yeast starter in this collection container directly then attach to the valve of the FermZilla so you can pitch yeast without needing to open the lid. This collection container has been designed to work with the magnetic stirrer machine The ports on the side of this collection container are the same as a standard coke bottle or soft drink bottle. The threads are designed to suit the stainless carbonation cap D60. These carbonation caps will enable you to purge oxygen for dry hopping, attach carbonation stone and carbonate liquid in the FermZilla, oxygenate wort and more.