The Zodiac and Jandy NeverLube 2-port diverter valve is designed for compatible plumbing systems that need straightforward control over a two-port flow path. A diverter valve is useful because it gives the system a dedicated control point for routing or isolating flow without depending on improvised plumbing workarounds.This replacement is especially useful when the original valve is worn, hard to turn, or no longer managing flow the way it should. The NeverLube design makes it especially appealing for buyers who want a smoother-maintenance valve solution.The 4718 is a practical plumbing control component when a compatible system needs a 2-port diverter valve to restore reliable operation and cleaner flow management. Zodiac and Jandy NeverLube 2-port diverter valve Designed for compatible two-port flow control applications Helps restore dependable routing and shutoff behavior Useful when the original valve is worn or unreliable Supports smoother-maintenance plumbing control