The STC series, manufactured by Caplugs, are plugs that has been designed for plugging quick disconnect coupling ports. It may also be used in applications that require less assembly time installation/removal, coupling ports on hydraulic motors, pumps, and other control devices. This device features a C dimension that is equipped with a bead. Furthermore, it has been constructed out of Flex Temp (Thermoplastic Rubber) and comes in a black color finish.