Beer bong - Cheap with PET bottle

Needed a beer bong, and didn't want to spent 30 euro on one. Instead I designed an interface with a 1/2 inch BSPT valve, a PET bottle, and a 1 inch armed water hose, for a total cost under 10 EUR. - Note that the BSPT standard is mainly used in Europe, and might not be found in the US.