Pentair QuikSkim Venturi Nozzle | 516478 Calcium Hardness The top valve assembly controls

The top valve assembly controls water flow through the filter

leaving it soft and refreshed after every bath

For soft water areas

5″ throat specification shared by all compatible models above

Pentair Part Number 354545S Part Name Mechanical Shaft Seal

Pentair QuikSkim Venturi Nozzle | 516478 Calcium Hardness The top valve assembly controlsThe Pentair QuikSkim Venturi Nozzle (516478) is the OEM replacement nozzle for the QuikSkim surface skimming system. The venturi nozzle is the functional core of the QuikSkim unit, using a pressurized water jet to create suction that draws surface debris toward the skimmer intake. When the nozzle is worn, cracked, or clogged beyond cleaning, surface skimming performance drops noticeably this direct replacement restores the system to factory operation.