"Turn your 20L Grainfather into a 10L version with the 10 L Micro Pipework.
Perfect for brewing smaller test batches, or for those who simply need a way to get brewing sooner.
The 10L Micro Pipework is perfect for brewing 10L beers, or 20L of a lower ABV strength beer".
Se: http://www.wagonbrewing.co.nz/grainfath ... o-pipework