Elbows join straight lengths of pipe, typically at angles of 45° or 90°, allowing for flow redirection. Wolverine Brass 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.