Vinyl Micro Tubing is used to extend drippers and micro sprinklers from mainline to your plants or as the primary line in a small system. Flexible vinyl will not kink as easily as polyethylene and is still resistant to UV rays. It may be used above or below ground. When using micro tubing, keep your line lengths to 30' or less. Anything over 30' and you may suffer PSI loss due to friction within the tubing. This does not mean you cannot use more than 30' of 1/4" tubing in your system, it simply means that the maximum point-to-point water path should not exceed 30' for any single length of 1/4" line. Tubing inside diameter size is .170" and the outside diameter is .250".