This standard describes bolted sleeve-type couplings, reducing or transition couplings, and flanged coupling adapters (couplings) used to join plain-end pipe. Couplings may be manufactured from carbon steel, stainless steel, or ductile iron and are intended for use in systems conveying water. This standard describes nominal coupling sizes 1/2 in. (13 mm) and larger. The purpose of this standard is to provide the minimum requirements for couplings of plain-end pipe, including requirements for materials, design, testing and inspection, installation, and shipping. This standard can be referenced in documents for purchasing the described couplings. The stipulations of this standard apply when this document has been referenced.Downloadable versions of current and historical standards are also available.