Pentair Suction Fitting Black | IntellipH Container | 521508 Specialty Chemicals locate the part number molded

locate the part number molded directly into your existing volute and confirm it reads 350089Z before ordering

Match the part number on your existing impeller to 355604Z to confirm you have the correct HP rating for your specific Challenger configuration before installation

Inspect your existing filter before ordering

Its 1-1/2" male-threaded (MPT) bottom connection makes it a direct-thread replacement for a wide range of spa filter housings — no adapter required in most applications

Pentair Suction Fitting Black | IntellipH Container | 521508 Specialty Chemicals locate the part number moldedThe Pentair Suction Fitting (521508) is the OEM replacement black suction fitting for the IntellipH Chemical Container, used within Pentair's chemical dosing systems. This fitting draws liquid chemical from the IntellipH container and delivers it into the dosing line. A cracked, brittle, or improperly seated suction fitting compromises chemical draw, resulting in inconsistent dosing and potential system faults. Replacing this fitting with the correct