Carbonation Cap Tee Fitting (Ball Lock QD) The Malt Shop Sale! from 90000 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. 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 SKU:EQCT ball Ball Lock bottle cap carbonation equipment fitting PET Plastic tee