Precison Marine Systems' Mach One and Mach Two Dart Powered Needle Wheel External Protein Skimmers deliver capacities of up 400 gal. for the Mach One and up to 700 gal. for the Mach 2. The water pump operates using 135 watts and offers dependable, cool-running, silent water and air flow, the company reports. Also, all models incorporate the Reeflo Dart Needle-Wheel pump, the company adds.