The Zodiac and Jandy diffuser is designed for compatible FHPF and VS 1 and 2 pump applications in the 1.5 HP to 2.5 HP range. A diffuser is useful because it helps shape internal water flow around the impeller, which is a major part of preserving efficient hydraulic performance inside the wet end.This replacement is especially useful when the original diffuser is cracked, warped, worn, or no longer fitting correctly within the assembly. Matching the correct horsepower-range diffuser helps keep the rebuild aligned with the intended pump design.The R0479701 is a practical repair part when a compatible Zodiac or Jandy pump needs a fresh diffuser to restore cleaner internal flow behavior. Zodiac and Jandy diffuser Designed for compatible FHPF and VS 1 and 2 pumps Supports 1.5 HP to 2.5 HP applications Helps restore proper internal hydraulic performance Useful when the original diffuser is damaged or worn