You will receive either the 3-piece or "S" stlye airlock. Both are very effective.
Posted by LD on 31st Oct 2012
Simple and easy to install and monitor.
Posted by Unknown on 13th Oct 2012
the 3 piece airlock is quite and the clean-up is great, it all comes apart so you can get it clean unlike the one piece airlock.
Posted by bobcat: drink drink not to much on 12th Aug 2012
ithink it is the one to use