Product Overview

The Pentair D-Series Diffuser O-Ring | C21-2 is the genuine Pentair replacement diffuser O-ring for Pentair D Series Commercial Pumps.

Ideal For

Replacing a flattened, cracked or leaking diffuser ring during pump service

Pool service professionals who stock Pentair parts

Key Features

Genuine Pentair OEM replacement part

Factory part number C21-2

Listed on the factory chart as the diffuser ring

Specifications

Warranty & Compatibility

Confirm your model and production date against the factory parts diagram before ordering. Not sure this is the right part? Call or text 725-205-1783 and a pool tech will confirm it before you buy.

Customer-Facing Q&A

Q: What part number is this?
A: Pentair part number C21-2.

Q: What does it fit?
A: The factory parts chart lists it for Pentair D Series Commercial Pumps.