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The Brewing Systems ships standard with one 3-way valve. This will normally be placed on the right side of the system, but if you don't want to sparge using the internal pump, you can install it on the left side to enable whirlpooling. Remember to get an extra dip tube if you want to use this option
By adding more valves, the flexibility will increase, and you can partly or completely avoid having to disconnect tubing or pipes during your brewday. What setup is the best, is subjective. A general advice is to start with the 2-valve starter pack and expand as you get more experience.
S = Temperatur sensor