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The 17388 provides a replacement transducer wick for the CSAT3. Three of them are used on the top 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 17388 provides a single wick. Three wicks are required. Ensure that your order or quote includes a quantity of three.