【Compatible with】Bypass dummy cells fit for Hayward salt cells T-CELL-3, T-CELL-5, T-CELL-9, T-CELL-15 and Blue Works Salt cell Model Number BLT3H, BLT9H, and BLT15H. *Not fit for Pentair salt cells. 【Prolong Salt Cell Lifespan】The dummy bypass cell acts as a reliable substitute for your electrolytic salt cell when it's removed, helping to significantly extend the operational life of your original salt cell. 【Leak-Proof Salt Cell Replacement】Ensure a secure, leak-free connection with this bypass salt cell, perfect for cold weather or when cleaning, maintaining, or repairing your system. 【Protect Your Pool Pump】Our dummy bypass cell maintains consistent water flow and shields your pool pump from freeze damage, ensuring uninterrupted water circulation and extending the life of your equipment. 【Easy Installation & Maintenance】Designed for hassle-free setup and minimal upkeep, this product keeps your pool system running smoothly without extra effort. Wide Compatibility: Fit for Hayward Salt cell Model Number T-CELL-3, T-CELL-5, T-CELL-9, and T-CELL-15