1. Manpower
One of the main characteristics of manual pumps is that they require manpower to make the manual pump work, not relying on electricity like electric diaphragm pumps. However, the manual pump rocker arm pumping water is relatively labor-saving and does not require too much effort. I believe everyone can accept it.
2. Use in liquids
The manual pump is a type of hydraulic pump, which is mainly used in liquids and relies on the pressure of the liquid as the driving force to work. This is actually a more environmentally friendly pump than an electric diaphragm pump, which does not pollute the environment and saves energy.