Grainfather Micro PipeworkTurn your Grainfather All Grain Brewing System into a small batch brewing system with the Grainfather Micro Pipework. Perfect for doing 2. 5 or 3 gallon batches so you can save time, experiment with test batches or have more varieties of beer on the go. The Micro Pipework is perfect for brewing half batches or standard batches of a lower ABV beer with a smaller grain bill. Works great when using 4 8 lbs of grain. California Proposition 65 Proposition