Make a really small and useful keg system out of PET plastic bottles. Great for taking beer to a party or making your own micro/portable/mini keg system. Below video is full of 6 ways you can use this adaptor.
Carbonation Cap Tee Adapter
This Tee adaptor has 1 Female port that will fit any standard Soda PET bottle (PCO 1881 Thread). It also has 2 female ports (also PCO 1881) where one can attach carbonation caps. Ideal for those who are trying to make a low-cost Keg from a soda bottle.
Please note the listing is for the Tee adaptor only. You will have to buy the carbonation caps, soda bottle, pipes and keg connects separately.