Size: 3 inches Length, 3/4 inches MPT 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). GF Piping Systems manufactures piping components and systems for gas and water distribution. The company, founded in 1802 and headquartered in Schaffhausen, Switzerland, meets International Organization for Standardization (ISO) standards 9001:2008 and 14001:2004.