Model P200 Hydra-Cell Metering Solutions pumps from Wanner Engineering have gearbox reducers with ratios from 60-to-1 to 5-to-1. Combined with variable-frequency drive electronic flow adjustment, they provide precise, accurate flow throughout the turndown range at up to 81 gph at pressure ratings to 350 psi for nonmetallic pump heads and 1,000 psi for metallic pump heads. The separate gearboxes also allow for versatility in changing applications and to prevent cross-contamination of actuating hydraulic oil. The multiple-diaphragm design minimizes pulsations, producing smooth, linear flow without the need for pulsation dampeners. A replenishment valve in every piston assembly ensures optimum actuating oil on every stroke for continuous accuracy. 612/332-5681; www.hydra-cell.com.