Unlike regular pump heads, foam pump heads have an enlarged air chamber at the throat. When released after the first press, a low pressure is created in the upper part of the pump head, thereby pumping the liquid to the upper part of the pump head, while the air enters the air chamber. On the second press, the air chamber is pressurized, pumping the liquid and air into the screen located on the pipe at the same time, so that the bubbles are blown. The smaller the screen, the smaller the bubbles blown and the finer the bubbles.

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