Pentair 4" Flange Assembly Kit With Gasket & Stainless Steel Hardware 357262

This kit is best for commercial pool, spa, and aquatic systems where a 4-inch pump connection needs to be replaced or rebuilt properly. It’s a strong fit for service pros, facility operators, and builders working on high-flow commercial circulation equipment where sealing integrity matters. If the old flange is cracked, warped, corroded, or leaking around the connection point, replacing the full assembly is usually the smarter move than trying to reuse old hardware. In the field, flange leaks often start small and turn into frustrating service issues once vibration, heat, and system pressure take over. Using the correct OEM kit helps keep the install cleaner and more reliable over time.

Best for:
Commercial pump repairs and replacements
High-flow pool and spa plumbing systems
Replacing damaged or aging 4" flange assemblies

Not ideal for:
Residential pool pumps with smaller plumbing sizes
Installations needing 2.5", 3", 5", or 6" flange kits
Buyers unsure of pump series or flange size

A lot of flange-related problems don’t come from the pump itself—they come from the connection hardware around it. Compared to trying to source individual bolts, reuse a compressed gasket, or adapt a non-OEM flange, the Pentair 357262 keeps the repair much cleaner and more predictable. On larger commercial systems, even a minor sealing issue can turn into a recurring leak, vibration point, or maintenance headache. That’s why using the proper flange kit matters more than many customers expect. If you’re already opening the connection, it usually makes sense to replace the gasket and hardware at the same time instead of gambling on old parts.

Pro Tip: Always inspect the mating flange face and pipe alignment before tightening everything down. Even the right flange kit won’t seal correctly if the connection is twisted, uneven, or overtightened.

The Pentair 357262 is commonly referenced in Pentair literature as a 4-inch flange kit used with select commercial pump applications, including EQ Series commercial plastic pumps and certain Aurora commercial pump accessory configurations. Exact fitment can vary based on pump body style, suction/discharge layout, and whether the system uses optional flange kits.

The safest way to confirm fit is to match:
your pump model
the connection size
and whether your system calls for a 4" flange assembly kit

Pro Tip: Don’t order based on pipe size alone. On commercial systems, flange fitment can depend on the pump series and connection style, not just the nominal plumbing diameter.