Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510 FS2004 Operates smoothly at wide salinity

Operates smoothly at wide salinity ranges of 2000-6000 ppm

When these O-rings wear

Even if the gasket appears intact

Vac-Sweep 165

In-Line (incl 2" inlet and outlet ports) CL2002S Hayward Automatic Chlorine Feeder

Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510 FS2004 Operates smoothly at wide salinityThe 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