Tubing over barbed fittings can be found in a number of low-pressure automotive and plumbing applications. The fitting, usually made of brass, has barbs that the tubing slides over. A clamp tightens over the tubing to hold it fast to the barbed fitting. The clamp keeps the tubing from blowing off the fitting when under pressure. The tubing can be removed from the barbed fitting in more ways than one.
Things You'll Need
Utility knife (optional)
Scalding hot water
Radiator hose pulling tool (optional)
Locate the screw holding the clamp over the tubing. Insert a flat-head screwdriver and turn the screw counterclockwise until the tubing clamp slides freely. Pull the clamp down along the tubing away from the fitting.
Cut the tubing with a utility knife. Cut it lengthwise where it attaches to the barbed fitting. Do this only if you don't plan on reconnecting the tubing. Just pull the tubing off the fitting once the cut is long enough. If you do plan on reconnecting the tubing to the fitting, go to Step 3.
Soak the tubing in scalding hot water. If the tubing is in an area where the use of water isn't possible, heat the hose with a hair dryer. Twist the tubing back and forth until it pulls off of the barbed fitting. The heat will help expand and soften the tubing until it can be pulled off the barbs.
You can use a radiator hose pulling tool if you have one.
Don't ever remove a hose when it's under pressure.