Fabricated pipe fittings are used to change the direction of the pipe. It connects pipe ends for many configurations such as multi-port, in-line, and offset. It is made from a wide range of materials. It is often circular in shape. The construction and material selection are application dependent. The most common types of pipe fittings include bulkhead fittings, rigid couplings, adapters, pitless adapters, and flexible couplings.