I have a deluxe bottom loader, how to switch from 5gal to 3gal , is there a shorter tube for 3gal that fits into bottle

Hi mjtra, thank you for reaching out. The top part of the probe has a mechanism that allows you to slide the top of the probe assembly to fit the bottle size. Please consult your dispensers' manual for more information. Dispenser manuals can be found at https://primowater.com/manuals/