Assuming that the "nozzle" has barbs and is slightly larger than 1/4" O.D., microwave some water in a cup and place about an inch of the tub in the water. This will soften up the line and hopefully you will be able to rotate around the end of the nozzle until the entire tube fits over it. Then worm the tube back and forth allowing the barbs to work for you. Place enough tubing on the nozzle so that you can use a clamp to secure.
Scott Zuhse, Instructor
Micro Matic Dispense Institute