It is generally not recommended to use PEX fittings on polybutylene (PB) pipe. PB pipe is a different type of plastic pipe that is not compatible with PEX fittings. PB pipe is typically joined using crimp fittings specific to PB, and it is important to use the appropriate fittings and tools for the specific type of pipe being used. If you are unsure about the type of pipe you have or the appropriate fittings to use, it is best to consult with a professional plumber.
PEX fittings are designed to be used with PEX pipes, which have a different composition and characteristics than polybutylene (PB) pipes. PEX pipes are made from a cross-linked polyethylene material that is flexible and durable, while PB pipes are made from a different type of plastic material. The two types of pipes have different properties and require different types of fittings to ensure a secure and reliable connection. Attempting to use PEX fittings on PB pipes could result in leaks, damage to the pipes or fittings, and other problems. Therefore, it is important to use the appropriate fittings and tools for the specific type of pipe being used.
