Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510 FS2004 O-rings on heater manifolds are

O-rings on heater manifolds are subjected to repeated thermal cycling that degrades the seal over time

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

or clogged impeller directly reduces flow rate and system pressure

Horsepower: Existing motor is in the 1–1

Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510 FS2004 O-rings on heater manifolds areThe 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