Product Overview

Restore a proper seal between your Pentair pool filter tank sections with the Pentair OEM Tank O-Ring | 39010200Z.

This genuine Pentair replacement O-ring is designed to seal the joint between the upper and lower sections of compatible Pentair filter tanks. The tank O-ring is a critical sealing component that helps prevent water from leaking around the filter tank seam when the system is operating under pressure.

Pentair part 39010200Z measures approximately 20-7/8 inches inside diameter with an approximately 7/16-inch cross section, making it suitable for several popular Pentair filter families.

Over time, filter tank O-rings can flatten, stretch, crack, dry out, or become damaged during routine filter cleaning. A deteriorated tank seal can result in water seepage or dripping around the filter clamp area. Replacing the worn seal with the correct genuine Pentair OEM O-ring can help restore proper sealing and dependable filter operation.

Key Features

• Genuine Pentair OEM replacement part

• Pentair part number: 39010200Z

• Filter tank body O-ring

• Approximately 20-7/8" inside diameter

• Approximately 7/16" thick

• Seals the joint between filter tank sections

• Helps prevent leaks around the tank clamp area

• Direct replacement for compatible Pentair filters

• Suitable for routine filter maintenance and repair

• Ideal replacement when the existing seal is cracked, stretched, flattened, or leaking

Specifications

Compatible Pentair Filter Families

Pentair 39010200Z is used with several Pentair filter systems, including compatible:

• Pentair Clean & Clear Plus Cartridge Filters

• Pentair FNS Plus D.E. Filters

• Pentair Quad D.E. Filters

• Select Pentair / American Products RPM-style filters

Compatibility may vary by filter model and production generation. Always verify the existing filter model and parts diagram before ordering.

What Does the Tank O-Ring Do?

The tank O-ring sits between the mating surfaces of the filter tank body.

When the filter is assembled and the clamp is properly secured, the O-ring compresses between the tank sections to create a watertight seal.

Without a properly sized and conditioned tank O-ring, pressurized water may escape through the tank seam.

Because the O-ring is disturbed whenever the filter tank is opened for cartridge or D.E. grid maintenance, it should be inspected each time the filter is serviced.

Signs Your Filter Tank O-Ring May Need Replacement

Consider replacing the tank O-ring if you notice:

• Water leaking around the filter tank seam

• Slow dripping beneath the tank clamp

• A flattened or permanently compressed O-ring

• Visible cracking or splitting

• Stretching or distortion

• Pinched or damaged areas

• Difficulty getting the filter tank to seal after servicing

• An O-ring that has become hard or brittle

A leak around the tank seam may also be caused by an improperly seated clamp, damaged tank surfaces, or incorrect clamp installation. Inspect all components before returning the filter to service.

Installation Information

Before servicing a pool filter, always shut off the circulation pump and completely relieve internal filter pressure.

For installation:

1. Turn off the pool pump.

2. Open the filter air-relief valve and verify that all pressure has been released.

3. Remove the filter clamp according to the filter manufacturer's instructions.

4. Separate the filter tank sections.

5. Remove the existing tank O-ring.

6. Clean the O-ring groove and sealing surfaces.

7. Inspect the replacement O-ring for damage.

8. Lightly lubricate the O-ring using an appropriate pool-equipment O-ring lubricant if required.

9. Seat the O-ring evenly in the proper location.

10. Reassemble the tank and secure the clamp according to Pentair specifications.

11. Restart the system and carefully inspect the tank seam for leaks.

Never open or loosen a pressurized filter.

Why Use a Genuine Pentair O-Ring?

The tank seal is a critical part of a pressurized pool filtration system.

Using the correct genuine Pentair replacement helps ensure:

• Correct dimensions

• Proper fit inside the tank sealing area

• Appropriate compression when the clamp is installed

• Reliable sealing under normal operating pressure

• Compatibility with the intended Pentair filter housing

An incorrectly sized O-ring may twist, pinch, leak, or prevent the tank sections from seating properly.

Frequently Asked Questions

What is Pentair 39010200Z?

Pentair 39010200Z is a genuine OEM filter tank O-ring used to seal the joint between the tank sections on compatible Pentair pool filters.

What size is the 39010200Z O-ring?

The O-ring is approximately 20-7/8 inches inside diameter and approximately 7/16 inch thick.

Does 39010200Z fit Clean & Clear Plus filters?

Yes. Pentair lists 39010200Z as the tank O-ring for compatible Clean & Clear Plus cartridge filters.

Does it fit Pentair FNS Plus filters?

Yes. This O-ring is also used on compatible Pentair FNS Plus D.E. filter assemblies.

Does it fit Pentair Quad D.E. filters?

Yes. Pentair lists 39010200Z as the tank O-ring used on compatible Quad D.E. filters.

Is the filter clamp included?

No. 39010200Z includes the tank O-ring only. The filter clamp, hardware, tank sections, and other components are sold separately.

Should I replace the O-ring every time I clean my filter?

Not necessarily. Inspect the O-ring whenever the filter is opened. Replace it if it is cracked, stretched, flattened, hardened, damaged, or unable to create a reliable seal.

Important Safety Notice

Pool filters operate under significant internal pressure.

Never loosen or remove the filter clamp while the system is pressurized.

Turn off the circulation pump, open the manual air-relief valve, and confirm that all internal pressure has been released before servicing the filter.

Pool Supply Depot recommends professional service if you are unfamiliar with pressurized pool filter disassembly or clamp installation.