The Pentair Seal Diffuser (355030Z) is the OEM replacement seal diffuser for the Challenger High Flow, SuperFlo, and SuperMax pump families. ⚠️ IMPORTANT: MANUFACTURE DATE APPLIES TO VARIABLE SPEED MODELS For the SuperFlo VS/VST and SuperMax VS variable speed pumps, this diffuser fits units manufactured before 06/17/19 only. Check the date code on your pump's label before ordering if you have a variable speed model. ⚠️ IMPORTANT: CHALLENGER HIGH FLOW — HORSEPOWER EXCLUSION This diffuser fits all Challenger High Flow pump models except the 5 HP configuration. Confirm your pump's horsepower rating before ordering. The seal diffuser sits between the impeller and the mechanical shaft seal inside the pump volute, directing water flow through the pump while maintaining the seal housing's alignment and integrity. A cracked or worn diffuser allows water to bypass the impeller rather than being directed through the pump, resulting in reduced flow, loss of prime, and accelerated wear to the shaft seal assembly. Replacing it restores designed hydraulic performance and protects the seal from premature failure. Specifications Pentair Part Number 355030Z Part Type Seal Diffuser Quantity Included 1 (Each) Fits Into Brand Equipment Line Model / Part Number Notes Pentair SuperMax — Pool Pump 348191 Seal Diffuser Pentair SuperFlo VS/VST Variable Speed Pump SUPERFLO-VS-VST Mfg. Before 06/17/19 Pentair SuperFlo VS/VST Variable Speed Pump SUPERFLO VS/VST Mfg. Before 06/17/19 Pentair SuperMax VS Variable Speed Pump SUPERMAX-VS Mfg. Before 06/17/19 Pentair SuperMax VS Variable Speed Pump SUPERMAX VS Mfg. Before 06/17/19 Pentair Challenger High Flow Pump CF-N1-3/4F All except 5 HP Pentair Challenger High Flow Pump CF-N1-3/4FE All except 5 HP Pentair Challenger High Flow Pump CF-N1-1-1/2FE All except 5 HP Pentair Challenger High Flow Pump CF-N1-2FE All except 5 HP Pentair Challenger High Flow Pump CF-N2-1F All except 5 HP Pentair SuperFlo Single Speed Motor — 3/4 HP 354803S SuperFlo pump seal diffuser Pentair SuperFlo Single Speed Motor — 1 HP 354821S SuperFlo pump seal diffuser Pentair SuperFlo Single Speed Motor — 1-1/2 HP 354823S SuperFlo pump seal diffuser Pentair SuperFlo Single Speed Motor — 2 HP 354815S SuperFlo pump seal diffuser Pentair SuperMax Motor — 3/4 HP 354804S Seal diffuser — SuperMax pump part Pentair SuperMax Motor — 1 HP 354822S Seal diffuser — SuperMax pump part Pentair SuperMax Motor — 1-1/2 HP 354824S Seal diffuser — SuperMax pump part Pentair SuperMax Motor — 2 HP 354816S Seal diffuser — SuperMax pump part Pentair SuperMax Motor — 1 HP SQFL 355021S Seal diffuser — SuperMax pump part Pentair SuperMax Motor — 1-1/2 HP SQFL 355023S Seal diffuser — SuperMax pump part Pentair SuperMax Motor — 2-1/2 HP SQFL 355027S Seal diffuser — SuperMax pump part Pentair Efficient SuperMax Motor — 1.5 HP SQFL 355011S Seal diffuser — SuperMax pump part Pentair Efficient SuperMax Motor — 2 HP SQFL 355013S Seal diffuser — SuperMax pump part Compatibility is based on Pentair
