Unscrew the cap on top and look down into the cyclinder or resevior. One tube will be several inches longer or taller or the end will be closer to the top of the resevior than the other. If the resevior has no cap to look into, the use a small stiff wire with a short hook on the end. Run the wire up from the bottom. Measure the stiff wire when it exits the tubes at their top. One will be several inches longer than the other.


Six volt guy living in a twelve volt world