PEX plumbing is used in homes and businesses for water supply and distribution. However, there are a few disadvantages associated with using PEX tubing including: The need to use transition fittings (and potential leaks) when transitioning between different types of pipes. It's more difficult to repair than other materials such as copper or cast iron. It cannot be used for outdoor plumbing applications due to its susceptibility to damage from sunlight exposure and chemicals such as herbicides, pesticides, chlorine bleach. If you have any other questions about PEX plumbing, don't hesitate to contact us! We would be happy to help!