Pentair Diffuser | SuperFlo VS / VST & SuperMax VS Variable Speed Pumps | 355949Z

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The Pentair Diffuser (355949Z) is the OEM replacement diffuser for the SuperFlo VS, SuperFlo VST, and SuperMax VS variable speed pump families. What It Does The diffuser sits direc tly behind the impeller inside the pump wet end, converting the high-velocity water leaving the impeller into pressure. A cracked, worn, or missing diffuser reduces hydraulic efficiency and can cause the pump to lose prime or deliver insufficient flow — replacing it with the correct OEM part restores the pump to its rated performance. Specifications Pentair Part Number 355949Z Part Type Diffuser Quantity Included Each (1) Fits Into Brand Equipment Line Model / Part Number Notes Pentair SuperFlo VS Variable Speed Pump — SuperFlo VS/VST Series SUPERFLO VS — Pentair SuperFlo VST Variable Speed Pump — SuperFlo VS/VST Series SUPERFLO VST — Pentair SuperMax VS Variable Speed Pump — SuperMax Series SUPERMAX VS — Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Pro Tip When the pump wet end is open for a diffuser replacement, inspect the impeller and shaft seal at the same time. These components share the same service interval and replacing them together avoids a second disassembly. Match the part number molded or stamped on your original diffuser to 355949Z before ordering to confirm you have the correct wet-end configuration for your pump. Show more