Swimables SW-21-149 WhisperFlo Pump Wet EndRestore Pump Performance Without Replacing the Motor When a pool pump starts leaking, losing prime, or circulating poorly, the issue often isnt the motorits the wet end. The Swimables SW 21 149 WhisperFlo Style Pump Wet End is designed to restore reliable water movement, eliminate leaks, and bring worn pumps back to life without the cost of replacing the entire unit. This wet end assembly is compatible with WhisperFlo style pumps from 0. 5 HP up to 2