| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-way stopcock in which a passage switching unit is not carelessly rotated. SOLUTION: This three-way stopcock comprises a stopcock body 1 having a first branch tube 11, a second branch tube 12 and a third branch tube 13, and a passage switching unit 2 capable of being rotatably and liquidtightly mounted at the body 1 and having a fluid passage 23 capable of communicating with a prescribed tube of the respective tubes through the other tubes. In this case, the passage 23 is switched by rotating the unit 2 with respect to the body 1. The stopcock further comprises a first engaging groove 14 formed in the body 1, a second engaging groove 24 formed in the unit 2, and a rotation preventive member 3 having a first engaging protrusion 30a and a second engaging protrusion 30b capable of being engaged with the grooves 14 and 24, respectively. |
