Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510 C7490 Filter Quad 100 Spring compression

Filter Quad 100 Spring compression for Quad D

dye-free formula leaves your skin and hair feeling incredibly soft and hydrated—without disrupting your water chemistry or fragrance experience

Brand Equipment Line Model / Part Number Notes Pentair SuperFlo VS Variable Speed Pump SUPERFLO VS SuperFlo VS/VST Series Pentair SuperFlo VST Variable Speed Pump SUPERFLO VST SuperFlo VS/VST Series Pentair SuperFlo VS/VST Variable Speed Pump SUPERFLO-VS-VST SuperFlo Series Pentair SuperFlo VS/VST Variable Speed Pump SUPERFLO VS/VST SuperFlo Series Pentair SuperFlo DOE Pump 348190 Replacement parts for Product #348190

and neutralization)

A cracked or broken lateral allows fine sand to bypass into the return line and reenter the pool — the most common sign that a lateral needs replacing

Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510 C7490 Filter Quad 100 Spring compressionThe Pentair Fitting Injection with Check Valve (521510) is the OEM replacement injection fitting assembly for the Pentair IntelliPH pH controller system. This fitting serves as the chemical injection point where the IntelliPH controller delivers pH adjusting solution directly into the pool's return line. The integrated check valve prevents backflow of pool water into the chemical feed line, protecting the controller's dosing mechanism and maintaining