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Automatic triple diaphragm pump with integral pressure switch. Triple diaphragm feature ensures smooth water flow. Will run dry without damage. Motor has internal circuit breaker for overload protection and are fully suppressed. Robust die cast alloy lower housing with twin ball bearing drive. This pump has low amp draw and is very quiet in operation. Pressure is suitable for the Rinnai, Vailant and Truma Ultrastore water heaters. Barbed hose connector supplied. 12 volts.