A figure "8" is used to close the end of your main line poly tubing and can be used with sizes .580-.710 (does not fit our .820). Easily comes off to allow you to flush your system out. Insert poly tubing into one side of the figure "8" fold it over and insert back through the other side of the figure "8". Ultimate UV protection and high quality plastic, to ensure long, trouble free, years of use.
