Adapters join pipes of different materials together or join threaded pipe ends with non-threaded pipe ends. Crimp brass pex fittings are made from high quality, lead free materials and are deisgned to be used with A or B tubing (B tubing is the preferred tubing because it is more resistant to UV). The fittings can be used with hot and cold water, potable water and in sealed central heating, including heated flooring applications.