Usage Tips:Designed for Compatibility: Specifically engineered for Navien NPE (A) Series Tankless Water Heaters, this water flow sensor ensures a perfect fit and optimal functionality, maintaining the integrity and efficiency of your heating system. Part Number 30008571A: This replacement part matches the specific part number 30008571A, guaranteeing reliability and the highest quality, ensuring your water heater operates smoothly without any compatibility issues. Advanced Triple Security Protection: Equipped with features to prevent dry burning, overload, and impurity filtration, this sensor enhances the safety and longevity of your water heater, providing peace of mind and sustained performance. Accurate Flow Control for Energy Conservation: This sensor not only accurately adjusts the heating power to match water usage but also activates heating only when necessary, significantly reducing standby energy consumption and boosting overall energy efficiency. The cable color is random. The specified color is not accepted Color: black Material: plastic Package Contents: 1 x water flow sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.