Simply insert tubing into one opening of the figure 8 fitting, fold the tubing over to create a kink, insert into the other opening to close, then slide the fitting toward the fold to secure it in place. Easy to use and economical, the clamp is removable, reusable, and works with any low-flow system. The end clamp is made of acrylonitrile butadiene styrene (ABS) treated with UV inhibitors to prevent cracking.