Air 

you can print with whatever material you want.. I made it so i can pour soap in our built in soap dispenser.. Now I made it so I hold it and it has a hole for air to come out!!!! its the same seize as old just with the handle and air let out..!! Can also use everywhere in the kitchen to fill small bottle… Can also download and change on your own.. Note you can download and scale it bigger if needed easy with bamboo studio!!!