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The 17389 provides a replacement transducer wick for the CSAT3. Three of them are used on the bottom arm of the assembly (one for each sonic transducer). These wicks are required when the embedded code of the CSAT3 is version 4.0 or later.
The 17389 provides a single wick. Three wicks are required. Ensure that your order or quote includes a quantity of three.