Pentair Fitting Injection with Check Valve | IntelliPH® Controller | 521510

The 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 accurate chemical delivery. Replacing a cracked, clogged, or failed fitting restores precise pH dosing and protects downstream components from water intrusion.

Specifications

Pro Tip

Before ordering, verify the part number against the fitting currently installed on your IntelliPH® system. Inspect the check valve for signs of chemical buildup or cracking — a compromised check valve can allow pool water to siphon back into the dosing line, which may damage the peristaltic pump head. Replacing this fitting at the first sign of leakage or discoloration prevents more costly repairs downstream.