Use this Adapter S100X8 female if your IBC have big valve with thread S100X8. This valve name is IBC tank container valve 3inch 100mm (DN80) Butterfly thread S100x8. And can find this valve in our shop also. From other side black adapter NPT / BST male thread 2 inch.
Adapter 3″ S100X8 (100mm) female to 2″ BSP/NPT Male Thread