Swimables SW-21-927 2HP Pump Diffuser with O-ring for WhisperFlo and IntelliFlo Pumps - This Pump Diffuser with O-ring is for use with Pentair WhisperFlo and IntelliFlo Pumps. The diffuser's purpose is to reduce the velocity of the impeller's flow, creating a pressure increase. It includes an O-ring to prevent leaks and provide a secure fit. Made for easy installation and use, this part will help ensure the best service life possible. It is created with top-tier parts and material.