Large-diameter O-rings play a critical role in sealing high-volume pool equipment, where even a minor leak can lead to water loss, air intrusion, and reduced system efficiency. The Aladdin O-240-0 O-Ring is a heavy-duty, multi-use pool equipment seal engineered to restore proper sealing performance across a wide range of pool pumps and filter systems.

Designed to replace several common OEM part numbers—including Hayward® CX900F, Pentair® / Sta-Rite® U9-228A, and Pentair® 39006000—this O-ring delivers OEM-equivalent fit, compression, and durability. It is commonly used in large filter tanks, pump housings, and equipment lids where consistent sealing pressure is essential.

At Benchmark Pool Supply, we frequently see leaks caused by oversized O-rings that have flattened, stretched, or hardened over time. The Aladdin O-240-0 is manufactured to precise dimensional tolerances using pool-grade elastomer, ensuring proper seating and long-term resistance to pool chemicals, pressure cycling, and temperature changes.

Multi-Brand Compatibility for Pool Equipment

The Aladdin O-240-0 O-Ring is designed as a versatile replacement seal for multiple manufacturers and equipment lines. Its large diameter and consistent cross-section make it suitable for a wide range of pool pumps and filters used in both residential and commercial installations.

Common compatible equipment includes:

• Hayward® StarClear™ Plus C900 & C1200 filters

• Sta-Rite® and Pentair® pump and filter systems

• Dura-Glas®, Max-E-Pro®, and Maxi-Glas pumps

• Swimquip™ and American Products® equipment

Because large O-rings must maintain even compression across the entire sealing surface, using the correct size and material is essential. The O-240-0 is engineered to meet those demands.

Why Replacing Large Equipment O-Rings Matters

Large O-rings are often overlooked during routine maintenance, yet they are exposed to constant mechanical stress and chemical exposure. When these seals fail, common symptoms include:

• Persistent water leaks around pump lids or filter tanks

• Air entering the system, causing loss of prime

• Reduced circulation and filtration efficiency

• Increased wear on pumps and motors

Replacing worn seals with the Aladdin O-240-0 O-Ring helps prevent costly repairs and extends the service life of your pool equipment.

Built for Demanding Pool Environments

This O-ring is manufactured from durable elastomer formulated specifically for swimming pool use. It resists swelling, cracking, and chemical degradation, making it suitable for continuous operation in chlorinated environments.

It is an excellent choice for:

• Preventive maintenance during seasonal service

• Repairing leaking pump lids or filter housings

• Pool professionals servicing multiple brands

• DIY pool owners seeking OEM-quality reliability

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you order the Aladdin O-240-0 O-Ring from Benchmark Pool Supply, you’re purchasing from a pool equipment specialist that understands real-world compatibility—not just part numbers. We stock parts that fit correctly, perform reliably, and help keep your pool system running without interruption.

If you need help confirming fitment for your specific pump or filter, our team is ready to assist.

Frequently Asked Questions

What is the Aladdin O-240-0 O-ring used for?

The Aladdin O-240-0 O-ring is a large-diameter pool equipment seal used in pump lids, filter tanks, and housings to prevent water and air leaks.

Which OEM parts does the Aladdin O-240-0 replace?

The Aladdin O-240-0 replaces multiple OEM parts including Hayward CX900F, Pentair 39006000, Sta-Rite U9-228A, and 35505-0422.

Is the Aladdin O-240-0 compatible with Hayward StarClear Plus filters?

Yes, the Aladdin O-240-0 O-ring is compatible with Hayward StarClear™ Plus C900 and C1200 pool filter systems.

Can this O-ring be used on Pentair or Sta-Rite pumps?

The Aladdin O-240-0 O-ring is commonly used on Pentair® and Sta-Rite® pumps and filters that specify OEM part U9-228A or 39006000.

Should I lubricate the O-ring before installation?

Yes, applying a thin layer of pool-safe silicone lubricant to the Aladdin O-240-0 O-ring helps ensure proper sealing and extends the life of the seal.