When it comes to selecting the best pipe for an exterior gas line, there are a few factors to consider, such as the type of gas, environmental conditions, and local building codes. Here are two common options for exterior gas lines: Polyethylene (PE) Pipe: PE pipe, also known as poly pipe, is a popular choice for outdoor gas lines. It is lightweight, flexible, and resistant to corrosion, making it suitable for various soil conditions. PE pipe is available in different sizes and is compatible with both natural gas and propane. Stainless Steel Pipe: Stainless steel pipe is another reliable option for exterior gas lines. It is highly resistant to corrosion, weather conditions, and UV radiation. Stainless steel pipes can handle high-pressure gas and are commonly used for underground and aboveground gas lines. It is crucial to consult with a qualified gas line installer or plumber to determine the most appropriate pipe material for your specific needs. They can consider factors such as gas type, pressure requirements, and local building codes to ensure the safe and efficient installation of an exterior gas line.