For equipment that is still worth keeping in service, Pentair IntelliChem/IntelliPH Accessory Bag (521895) helps address the worn component instead of replacing the larger assembly. The accessory bag keeps supporting IntelliChem or IntelliPH service pieces together for installation, repair, or seasonal maintenance. It is especially useful for chemical automation and feeder systems where sensor accuracy, controlled dosing, and dependable water-balance feedback matter.. Supports compatible Pentair equipment service Helps restore fit, function, or system reliability Useful for repairs, rebuilds, and preventive maintenance Confirm the model, voltage, plumbing size, horsepower, or system generation before ordering. Matching the 521895 part number helps reduce installation issues and keeps the repair focused on the component that actually needs attention.