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.
OEM Waterway Manifold Nut for Crystal Water DE Filters 718-4320 is a critical replacement part designed to hold the manifold securely in place within Waterway DE filter systems. This high-quality nut is manufactured from durable materials to withstand the pressure and conditions of regular pool operation. Engineered to match Waterway specifications, it helps ensure long-term reliability and contributes to maintaining proper system function and water clarity.
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Key System Fastener: Holds the manifold firmly in place, allowing your DE filter to function at optimal capacity.
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Strong Material Build: Constructed from tough, corrosion-resistant materials for dependable performance over time.
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Crystal Water Compatibility: Designed to fit seamlessly with Waterway Crystal Water DE filter systems.
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Precision-Fit Design: Manufactured to exact OEM dimensions for hassle-free replacement and proper fit.
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Ensures Filter Stability: Contributes to balanced system pressure and effective filtration by stabilizing internal components.
- (1) Waterway 718-4320 Manifold Nut
- Waterway Crystal Water DE Filters

