Pentair Letro Booster Pump Volute (LA39534) filters The SPX3220CM is a practical The SPX3220CM is a practical replacement for compatible Hayward TriStar SP3200X pumps that need renewed impeller performance and cleaner long term operation The smooth gray and stainless finish gives this Waterway part a refined surface appearance that works especially well in spas where the visible hardware is meant to look polished rather than purely functional Helps form the wet end housing and discharge pathway The Pentair Letro LA39534 booster pump volute is designed for compatible Letro booster pump applications where the main wet end housing needs replacement