Find your parts diagram
Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
Still not sure? Call (818) 818-6559 and we'll find it for you.
O-537 | Aladdin EQ Series Pump Lid O-Ring | 350166
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
The Aladdin O-537 EQ Series Pump Lid O-Ring (OEM 350166) is a direct replacement gasket designed for use with the Pentair EQ-Series commercial pool pumps’ hair and lint strainer lids. Crafted from durable, chemically-resistant elastomer, this O-ring ensures a tight, leak-proof seal between the lid and pump housing — preventing water loss and maintaining proper internal pressure. It’s engineered to meet original equipment specifications and withstand the harsh conditions of chlorinated pool or spa water, making it an essential maintenance part when servicing or resealing your pump.
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OEM-Spec Compatibility: Perfect fit for Pentair EQ-Series pump lids (part number 350166), ensuring seamless installation without modifications.
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Reliable Leak Prevention: Seals the strainer lid tightly to the pump housing to prevent water leaks, pressure loss, or air intrusion during operation.
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Chemical-Resistant Construction: Made from pool-grade rubber that resists degradation from chlorine, salt, and temperature variations — ensuring longevity.
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Essential for Maintenance: Recommended whenever the lid is removed for cleaning or inspection, or during routine pump servicing to restore full sealing performance.
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Supports Pump Efficiency: Proper sealing helps maintain consistent water flow and pressure, contributing to efficient filtration and extended pump life.
- Pentair EQ Series Pumps