DD series pressure automatic diaphragm pump has built-in bypass switch, which can minimize pump cycle start even if the flow is large. This structural design can be installed to up to four 19 mm (3 / 4 inch) water outlets without installing pressure tanks. It is also suitable for water systems connected to water tanks. It is usually used in yachts, RV and mobile cabin. The maximum flow of this 4-chamber diaphragm pump can reach 12.5 liters per minute. It has the following advantages: self absorption, short-time dry operation, reliable performance and low current. The automatic diaphragm pump with pressure switch can start automatically when the faucet is turned on and stop automatically when the faucet is turned off. The quick installation port makes the pump have the characteristics of convenient installation, easy operation, easy drainage and anti freezing.