External spring means that the spring is externally visible, usually placed above the pump core. Internal springs are the opposite of external springs. Inner springs are invisible and are generally located in the middle.

The built-in spring can directly contact the liquid, and is generally suitable for health care products, such as essential oils, perfumes, and skin care water, which are close to water.

Our factory mainly produces foam pumps head,we have internal springs and external springs to choose from, welcome to consult and place an order!