While multiple different pumps can fit on the same bottle neck it’s important to get familiar with the dip tube length of your chosen pump. We often refer to this as the dip tube length from base of gasket (FBOG). This measurement is obtained by measuring the entire length of the dip tubes from the inside of the pump collar/skirt.

Keep in mind that your required dip tube length is likely to change amongst pumps based on the size, length and design of the pumps housing.