The MVPS-RE1 drop-in package for existing progressive cavity systems from Webtrol Pumps is designed for reliable operation and nearly constant flow, adjustable for pressure variations in any system setting, according to the manufacturer. It is powered by a 1 1/2 hp, 1,750 rpm motor that provides grinding torque. All package parts are readily available and easily replaceable. 800/769-7867; www.webtrol.com.