3/16" ID tubing that is UV light and ozone resistant, Excelon Excelprene industrial tubing offers superior performance over general purpose rubber tubing at a much lower cost than similar alternative options. Reliable and durable, it offers years of use without cracking or weakening, even in extreme environments. And, since it's able to be joined without fittings and is heat sealable, it's easy to install and use as well. Sold by the foot. Color varies, either black or natural/white.