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The Zodiac S16 Pump PCB (W222131) is a genuine replacement part designed for Zodiac LM2 and LM3 chlorinator systems equipped with an S16 pump for chemical dosing, such as acid for pH management. This printed circuit board (PCB) assembly, also referred to as the LM S16 Pump PCBA RKIT, controls the operation of the dosing pump, ensuring precise and consistent delivery of chemicals to maintain optimal pool water chemistry. See part 7 in the diagram below
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