Sealing performance is ensured between the sliding contact surface of the discharge cylinder and the opening peripheral edge of the communication hole in the body cylinder. A sliding contact surface 14 extending in a circumferential direction and slidably contacting with the body cylinder when the discharge cylinder rotates and moves is formed at a base end of the discharge cylinder, A communication hole 15 opened toward the sliding contact surface is formed on the sliding contact surface, an introduction hole 16 communicating with the discharge hole 13 and capable of communicating with the communication hole is opened on the sliding contact surface, The slide contact surface is provided rotatably between a discharge position where the introduction hole and the communication hole communicate with each other and a blocking position where communication between the introduction hole and the communication hole is blocked in a state where the slide contact surface liquid-tightly...

You do not currently have access to this content.