This Tapcooler Ball Lock Adapter is perfect for homebrewers and beer enthusiasts looking to simplify the bottling process. Use it when you're bottling your homemade beer to quickly connect the gas ball lock fitting. It inserts into the push - fit CO2 connector of the Tapcooler Counter Pressure Bottle Filler. No complex technical details here, just an easy - to - use accessory to make your bottling experience great.