The three piece airlocks are a great choice for monitoring and stopping contaminants entering your fermenter.

Simple set up, just fill with pre-boiled water, or sanitiser mixture, and insert into your pre drilled hole/bung on your fermenter. The airlock creates a closed fermentation from inward contaminants. It will allow CO2 to blow off but not let any O2 or bugs into your fermenter.

The brilliant thing about that makes the 3 Piece PP KegLand Airlock better than any S type other airlocks is that it can be put in the dishwasher to sterilise and not crack!