This specification covers the requirements for materials, workmanship, dimensions, and burst pressure of poly(vinyl chloride) plastic Schedule 80 pipe fittings, intended for use with the distribution of pressurized liquids that are chemically compatible with the piping materials. In-line fittings, such as couplings, unions, bushings, caps, nipples, and the like, shall be molded or machined from extruded stock. The pipe fittings shall conform to the specified inside and outside diameter, minimum wall thickness, dimension, and burst pressure strength requirements. The fittings shall be homogeneous throughout and free of cracks, holes, foreign inclusions, or other defects and shall be as uniform as commercially practicable in color, opacity, density, and other physical properties.