This Anvil cap is a class 150 steel pipe fitting with female National Pipe Taper (NPT) threads for closing and terminating the male end of a pipe or fitting. It has NPT threads for creating a tighter seal than straight threads. The cap has a hexagonal shape for increased leverage and use with a wrench during installation and disassembly. This fitting is made of steel and has a black finish to provide greater rust resistance than iron and can be used for oil and gas applications. The pressure ratings for this class 150 cap are 150 pounds per square inch (psi) for steam and 200 psi for water, oil, and gas (WOG), and the fitting meets specifications ASTM A53 and ASME B 1.20.1 for quality assurance. Class is a standard relating to tolerance, construction, dimension, and wall thickness, but it is not a direct measurement of maximum working pressure. Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. When purchasing pipe fittings, consider the application, as this will affect material type, shape, size and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness). Anvil International provides pipe products and design services. The company, founded in 1850 and headquartered in Portsmouth, NH, meets International Organization for Standardization (ISO) 9001:2000 standards and is certified by the American Petroleum Institute (API). Its fittings meet American Society for Testing and Materials (ASTM) and American Society of Mechanical Engineers (ASME) specifications.