This is a funnel to get dry ice into the SodaStream CO2 charging bottle.
I refill my SodaStream CO2 bottle using dry ice. The dry ice in my area comes in big blocks that have to be broken into small enough pieces to fit into the top of the bottle. I was using a regular funnel that fits inside the top of the bottle. The internal funnel reduces the size of the hole that I have to get the dry ice through. It was taking a long time to get the dry ice small enough to get through the funnel into the bottle.
This funnel fits snug over the top and holds tight to the outside maximizing the size of dry ice chunks that can go in the bottle saving me time, effort, and CO2 loss. The cone design is working out to be very strong.