The WEBTROL Pumps MVPS-RE1 drop-in package for existing progressive cavity systems from Weber Industries provides reliable operation and nearly constant flow, easily able to adjust 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.