The Pentair Diffuser O-Ring U9-266 Reliable Replacement Seal for brings dependable, professional-grade performance to your pool setup.

The Pentair Diffuser O‑Ring U9‑266 is a genuine OEM replacement seal designed to maintain a secure, leak‑free connection between the diffuser and pump or filter housing. This top-tier O‑ring helps prevent water and pressure loss while ensuring stable hydraulic performance in your pool system.

Made from chemical‑resistant elastomer material, the U9‑266 O‑ring withstands exposure to pool water, sanitizers, and environmental stress without cracking, swelling, or degrading. It’s an essential part for routine maintenance or repair projects where proper sealing is critical to avoid leaks, maintain flow, and protect internal components.

Have questions before you order? Our team is happy to help you pick the right part.