Designed for high flow, the 5000 Series pump from Pentair/SHURflo has a co-molded diaphragm, ensuring long life. An optional internal, adjustable bypass is designed for smooth, low-cycling flow. The automatic demand pump offers flows up to 5 gpm at 55 psi and can run dry without damage. Cycling can be reduced with an available internal bypass. It has automatic thermal overload protection, a built-in check valve to prevent backflow, dry priming to 6 vertical feet, automatic demand, and 1/2-inch NPT male or female ports. It is CE and NSF listed. 800/854-3218; www.shurflo.com.