Pentair Challenger High Pressure 3.0 HP Diffuser (355545Z) spafilters It is commonly replaced when

It is commonly replaced when the original collar becomes cracked

Four replacement skirts for compatible Poolvergnuegen cleaners

Balboa TP260T overlay

or no longer providing the correct flow direction

and this Magic Plastics UniBody version features a 2 inch union by 2 inch slip configuration with a 100 psi rating using the 0516-20 reference

Pentair Challenger High Pressure 3.0 HP Diffuser (355545Z) spafilters It is commonly replaced whenHigh pressure Challenger systems need a diffuser that supports the correct internal pressure and flow characteristics. This 3. 0 HP Pentair diffuser is intended for compatible high pressure Challenger configurations and helps maintain the wet end geometry needed for efficient operation. Choose it when servicing a pump that has lost performance due to internal part wear, breakage, or improper previous repair. Made for select 3. 0 HP high pressure