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.
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O-87 | Aladdin Universal 18" Filter Tank O-Ring
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
The Aladdin O-87 Universal 18-inch Filter Tank O-Ring is engineered to restore a dependable, watertight seal on a wide range of 18" single- and two-piece filter tanks. Molded from durable, chemical-resistant elastomer, it maintains flexibility under pressure, preventing leaks around the tank’s mid-clamp or lid band. Its universal fit design matches the dimensions used on many sand and cartridge filters, allowing the O-ring to seat cleanly in the tank groove for consistent sealing, stable operating pressure, and reliable filtration performance.
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Universal 18" Fit: Sized to match common 18-inch filter tank sealing grooves across multiple sand and cartridge filter models.
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Leak-Tight Performance: Forms a reliable barrier that prevents water seepage and pressure loss at the tank clamp or lid joint.
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Chemical-Resistant Material: Constructed from long-lasting elastomer that withstands chlorine, heat, and outdoor exposure.
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Secure, Even Seating: Precision-molded to sit smoothly in the tank channel for consistent sealing during routine maintenance.
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Supports Filter Efficiency: Helps maintain stable internal pressure for optimum sand or cartridge filtration performance.