Automatic shut-off valves in both socket and plug for vacuum applications. Each can withstand a vacuum of as high as 1.3 x 10-1 Pa even when disconnected. Uses automatic shut-off valves with ultra-tight sealed construction in both socket and plug. Ideal for vacuum applications. Having automatic shut-off valves in both socket and plug facilitates easy fluid handling. Suitable for a wide range of vacuum applications as high as 1.3 x 10-1 Pa {1 x 10-3 mmHg} even when disconnected. Three types of seal material are available to suit any of the diversified production lines for air conditioners, refrigerators or similar. Can be connected with SP Cupla.