- Look no further than our simple Prinsu Rotopax mount to mount up your 1 gallon, 2 gallon, or 3 gallon Rotopax. Our simple mount comes powder coated black to match your roof rack and includes all necessary hardware. This mount allows you to mount any of the above mentioned Rotopax sizes lengthwise on the rack from front to back. Give yourself a few minutes to install the mounts and you will be ready for that next adventure! (*Actual Rotopax mounting brackets are sold separately)