Description
This replacement pentair 355331 diffuser o-ring is used with Pentair Challenger high flow (5hp) and high pressure inground pumps. It is also compatible with Pentair WaterFall specialty pumps. O-Ring is 1/8″ thick and measures just under 3″ inside diameter.
What to expect:
This item includes three (3) o-rings in a resealable zip-top poly bag with “Captain O-Ring” branded packaging.

![Pentair 355331 O-Ring [3 Pack]](https://www.diyhardwareshop.com/wp-content/uploads/2026/07/pentair-355331-o-ring-3-pack.webp)

