Pentair Diffuser O-Ring 1-1/2″ for DURAGLAS / MAXIGLAS, PLM Filter, JWP / JWPA Pump | U9-226

Description

The Pentair U9-226 is the OEM replacement diffuser O-ring for the JWP and JWPA aboveground pump series, PLM aboveground cartridge filter systems, and the Waterford sand filter system valve — including DURAGLAS and MAXIGLAS filter configurations.

⚠️ IMPORTANT: LUBRICATION REQUIRED — SOLD SEPARATELY
Always lubricate this O-ring with a silicone-based lubricant before installation. We carry the Pentair R172351 Lifeguard® Silicone Lubricant — the OEM-matched product for Pentair equipment.

This O-ring seals the diffuser assembly within the pump, maintaining the pressure differential that drives water through the impeller. A degraded or cracked diffuser O-ring allows water to bypass the impeller, reducing flow and pump efficiency. Replacing it restores the seal and full hydraulic performance. Match the part number stamped on your existing O-ring before ordering.

Specifications

Fits Into

Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment’s manual or on the original part itself before ordering.

Pro Tip

Before installation, apply a thin coat of Pentair R172351 Lifeguard® Silicone Lubricant to the O-ring. This helps seat it evenly, prevents tearing during assembly, and extends service life. Never use petroleum-based lubricants — they will degrade the rubber and cause premature failure.