The PET beer keg is developed by Dispack Projects. It has a nylon valve system that would make the whole keg more environmentally friendly and cost effect for the beer industry. They have been developing 20 liter and 30 liter kegs that have a glass reinforced nylon valve system instead of the traditional standard steel.
The Dolium tanks connects with more standard filling and dispensing systems while the finished system is both lighter to transport, and — because PET is easy to recycle — doesn’t have to be transported back to the beer companies when they’re empty.