• Automatic triple diaphragm pumps with integral pressure switch to ensure a smooth water flow. • Will run dry without damage. • Motors have integral circuit breaker for overload protection and are fully suppressed. • Robust die cast alloy lower housing with twin ball bearing drive. • These pumps have low amp draw and are very quiet in operation. • 20psi is suitable for low pressure water storage heaters • Volts:12v. • Flow: 7.litres/min. • Pressure: 20psi. • Noise:57db & 61db • Self priming.