This is a little nozzle that fits into the water dispenser on your fridge to spray unsuspecting victims. Scale it up or down to fit your hose size, and add just a little bit of tape to it if you need a little extra press fit. It's very low profile, so people don't even realize it's there.

--Printing Tips--

Print at 0.08mm layer height to make sure the nozzle hole works. You may need to print several to get the scaling right. The default size is a 4.7mm diameter (which worked on my fridge)