Here is a quick, easy and cheap way to make Ball Lock airlocks. I got this idea from Trong at Home Brew Labs. He creates great gadgets for home brewing, like Spundit 2.0
Need more space to store your homebrew?
Buddies not returning your bottles?
Why not go for a keg or four?
They're only $219.99...
These kegs are a bit older, and have seen quite a bit of use in the beverage industry.
They've been checked for parts and pressure tested, but...