The SMC KQ series plug fitting is made of polybutylene terephthalate (PBT) and has a tube connector. This plug fitting inserts into a pipe or fitting to close and terminate its end. It is a push-to-connect fitting that accepts the insertion of nylon, soft nylon and polyurethane tube fittings. This fitting is made of polybutylene terephthalate (PBT), which is a polymer resistant to solvents, shrinkage, heat, and impact. It can be treated to increase resistance to UV and flammability. The working pressure for this fitting is up to 145 pounds per square inch (psi), and its operating temperature ranges from -5 to 60 degrees C.Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. Push-to-connect compression fittings do not require tools or sealants, and are useful in installations where a heat source, such as a soldering torch, is prohibited. 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).SMC Corporation manufactures actuators, valves, airline equipment, connector fittings, electrical products, vacuum products, dryers, temperature control chillers, and accessories. SMC Corporation of America is headquartered in Noblesville, IN, and meets International Organization for Standardization (ISO) 9000:2000 standards.