Swimables SW-21-564 Seal Plate with Gasket and Shaft Seal for WhisperFlo and IntelliFlo Pumps - This Seal Plate, Gasket and Shaft Seal are for use with Pentair WhisperFlo and IntelliFlo Pumps. The seal plate seals the pump volute while serving as a spot to install part of the shaft seal. The shaft seal prevents liquid escaping from a shaft. Made for easy installation and use, these parts will help ensure the best service life possible.