Bubble Magus DSP4000 Replacement Impeller Bubble Magus DSP4000 Replacement Impeller is a replacement needle wheel impeller for the DSP4000 pump used with Bubble Magus Curve A9 or 9+ Protein Skimmers. It helps restore smooth pump rotation and proper skimmer bubble production. DSP4000 Needle Wheel Impeller Compatibility Replacement needle wheel impeller for the Bubble Magus DSP4000 pump. Compatible with Bubble Magus Curve A9 or 9+ Protein Skimmers. Helps restore pump startup, air draw, and foam production. Pump body is not included. DSP4000 Impeller Service Notes Unplug the skimmer before removing the pump. Open the pump cover, remove the old impeller, clean the impeller well and shaft area, then install the replacement impeller. Reassemble the pump and confirm smooth operation before returning the skimmer to normal use. What's Included One Bubble Magus DSP4000 Replacement Needle Wheel Impeller.