1/4 Keg CO2 Refill Bulbs for the Leland CO2 PicnicTap - 2 PACK Each bulb contains CO2 for a 1/4 keg For use with the Leland CO2 PicnicTap Beer Pump. These keg tap refills are perfect for tailgating and outdoor parties. Use 2 gas bulbs for 1/2 keg. 2 bulbs per pack.