A leaking filter tank seam on a Nautilus or FNS filter is almost always caused by a worn or flattened tank O-ring. The Aladdin O-420-0 Nautilus FRP / FNS Tank O-Ring is a heavy-duty replacement seal engineered to restore a secure, watertight connection on Pentair Pac Fab filters manufactured after 2001.

Designed as a direct replacement for Pentair® OEM part 195008, this tank O-ring delivers OEM-equivalent fit, compression, and durability. It is specifically used on Pac Fab Nautilus FRP and FNS filters, where even sealing pressure around the tank circumference is critical to safe operation.

At Benchmark Pool Supply, tank O-ring failures are one of the most common causes of filter leaks we see in the field. Over time, exposure to chlorine, pressure cycling, and heat causes large tank O-rings to lose elasticity or deform. Replacing the seal with the Aladdin O-420-0 helps prevent water leaks, air intrusion, and uneven stress on filter clamps and housings.

Manufactured from pool-grade elastomer, this O-ring is built to withstand the high pressures and chemical exposure found in modern pool filtration systems.

Designed for Nautilus FRP & FNS Filters (After 2001)

The Aladdin O-420-0 O-Ring is precision-sized for post-2001 Pac Fab Nautilus FRP and FNS filter tanks. Its profile ensures consistent compression around the entire tank seam, reducing the risk of blowouts, clamp issues, or recurring leaks.

Common applications include:

• Pac Fab Nautilus FRP filter tank seals

• Pac Fab / Pentair FNS filter tank O-rings (after 2001)

• High-pressure DE filter tank sealing applications

Using the correct tank O-ring is essential, as undersized or hardened seals can lead to unsafe operating conditions and premature equipment failure.

Why Replacing Tank O-Rings Is Critical

Tank O-rings are among the most highly stressed seals in a pool system. When they fail, symptoms often include:

• Water leaking at the filter tank seam

• Air entering the filtration system

• Reduced filtration efficiency

• Increased strain on tank clamps and housings

Replacing a worn seal with the Aladdin O-420-0 Tank O-Ring helps maintain proper system pressure and extends the service life of your filter.

Built for High-Pressure Pool Filtration Systems

This O-ring is engineered specifically for DE filter applications and maintains elasticity under continuous pressure. It is suitable for both residential and commercial installations.

Ideal for:

• Seasonal DE filter servicing

• Tank resealing after internal maintenance

• Professional pool technicians

• DIY pool owners performing filter repairs

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the Aladdin O-420-0 Nautilus FRP / FNS Tank O-Ring from Benchmark Pool Supply, you’re buying from a pool equipment specialist who understands real-world filtration repairs—not just part numbers. We stock proven replacement parts that fit correctly and perform reliably under pressure.

If you need help confirming whether your Nautilus or FNS filter is a post-2001 model, our team is always ready to help.

Frequently Asked Questions

What is the Aladdin O-420-0 O-ring used for?

The Aladdin O-420-0 O-ring is used to seal the tank halves on Pac Fab Nautilus FRP and FNS pool filters manufactured after 2001.

Which Pentair part does the Aladdin O-420-0 replace?

The Aladdin O-420-0 is a direct replacement for Pentair OEM part number 195008.

Is this O-ring compatible with all Nautilus filters?

The Aladdin O-420-0 O-ring is designed for Pac Fab Nautilus FRP and FNS filters manufactured after 2001 and is not compatible with earlier tank designs.

Can this O-ring be used on FNS DE filters?

Yes, the Aladdin O-420-0 O-ring is commonly used on Pentair Pac Fab FNS DE filters that specify OEM part 195008.

Should I lubricate the tank O-ring before installation?

Yes, applying a thin layer of pool-safe silicone lubricant to the Aladdin O-420-0 O-ring helps ensure proper sealing and extends O-ring life.