Pentair 357098Z Diffuser O-Ring (Blue Coating) — Dyna-Pro Pump Seal – Dyna Pro Pump Parts And Accessories

Pentair 357098Z Diffuser O-Ring (Blue Coating)

Blue-coated diffuser O-ring 357098Z for Pentair Dyna-Pro, Max-E-Pro & DynaWave pumps. Reliable seal to stop leaks and maintain pump performance.

Features

• OEM blue-coated O-ring made for Pentair’s Dyna-Pro, Max-E-Pro, and DynaWave pump models. :contentReference[oaicite:5]{index=5}
• Chemical-resistant material protects from chlorine/pool water corrosion. :contentReference[oaicite:6]{index=6}
• Precisely sized to provide a tight seal for diffuser assemblies. :contentReference[oaicite:7]{index=7}
• Helps restore pressure, stop leaks, and reduce noise from escaping water.
• Small, economical part that prevents costly pump failures.

Description

The Pentair 357098Z diffuser O-ring is a small but crucial seal between the diffuser and the pump body in Pentair’s Dyna-Pro, Max-E-Pro, and DynaWave series pumps. With a blue coating and durable elastomer construction, it resists chemical exposure and heat. When this O-ring fails, leaks, or causes a loss of pressure, it can reduce pump efficiency or damage other parts. Replacing the seal is quick and straightforward, and restores proper flow and pump performance.

Pro Tip

Apply a thin, pool-safe lubricant to the O-ring before installation to help it seat correctly. Also check mating surfaces (diffuser & seal plate) for nicks or damage—any irregularities can cause leaks even with a new seal. Always have spares on hand, since O-ring degradation is common in pool service.

Installation Tips

Always shut off and lock out power before removing the pump diffuser. Ensure the old O-ring surface and housing groove are clean & dry. Lubricate the O-ring with a pool-safe silicone grease; do not over-stretch. Reassemble carefully to avoid twisting or pinching the seal.