Automatic triple diaphragm self-priming 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. Robus die cast alloy lower housing with twin ball bearing drive. These 12v pumps have low amp draw and are very quiet in operation. 1 angle and 1 straight hose connector supplied for 13mm diameter flexible hose.