A unit which can be provided in a liquid flow channel including a hose, the unit comprising: a hollow tube body; three or more tube stubs (5A, 5B, 5C, 5D) communicating the inside of the tube body; and a connection fitting (6A, 6B, 6C, 6D) provided with each of the tube stubs and detachably connectable to a connection target of same shape, wherein the tube stubs include: a first tube stub having an axis parallel to a first axis direction; a second tube stub having an axis parallel to a second axis direction crossing the first axis direction; and a third tube stub having an axis parallel to a third axis direction crossing a plane surface including the first axis direction and the second axis direction, wherein the connection fitting (50A, 50B) includes an annular fitting body, a plurality of protrusions arranged in a circumferential direction at an end of the fitting body and having hooks in side surfaces of the protrusions, and a plurality of recesses formed between the protrusions adjacent to each other, when the connecting fitting (50A, 50B) is rotated in the circumferential direction with respect to the connection fitting of a connection target in a state where the protrusions of the connection fitting fit in the recesses of the connection fitting of the connection target, the hooks in the connection fittings engage each other prohibiting movement of the fitting body in an axial direction with respect to the projection of the connection fitting of the connection target, and the three or more tube stubs (5A, 5B, 5C, 5D) each include a rotation mechanism (7A, 7B) which rotatably connects the connection fitting of the tube stub and the tube body around axis of the tube stub, and when the connection fitting is rotated by the rotation mechanism, the connection fitting and the connection fitting of the connection target can be coupled or decoupled, wherein the first tube stub (5A, 5B), the second tube stub (5C, 5D) and the third tube stub (5E, 5F) each include the rotation mechanism (7A, 7B, 7C, 7D, 7E, 7F). a hollow tube body; three or more tube stubs (5A, 5B, 5C, 5D) communicating the inside of the tube body; and a connection fitting (6A, 6B, 6C, 6D) provided with each of the tube stubs and detachably connectable to a connection target of same shape, wherein the tube stubs include: a first tube stub having an axis parallel to a first axis direction; a second tube stub having an axis parallel to a second axis direction crossing the first axis direction; and a third tube stub having an axis parallel to a third axis direction crossing a plane surface including the first axis direction and the second axis direction, wherein the connection fitting (50A, 50B) includes an annular fitting body, a plurality of protrusions arranged in a circumferential direction at an end of the fitting body and having hooks in side surfaces of the protrusions, and a plurality of recesses formed between the protrusions adjacent to each other, when the connecting fitting (50A, 50B) is rotated in the circumferential direction with respect to the connection fitting of a connection target in a state where the protrusions of the connection fitting fit in the recesses of the connection fitting of the connection target, the hooks in the connection fittings engage each other prohibiting movement of the fitting body in an axial direction with respect to the projection of the connection fitting of the connection target, and the three or more tube stubs (5A, 5B, 5C, 5D) each include a rotation mechanism (7A, 7B) which rotatably connects the connection fitting of the tube stub and the tube body around axis of the tube stub, and when the connection fitting is rotated by the rotation mechanism, the connection fitting and the connection fitting of the connection target can be coupled or decoupled, wherein the first tube stub (5A, 5B), the second tube stub (5C, 5D) and the third tube stub (5E, 5F) each include the rotation mechanism (7A, 7B, 7C, 7D, 7E, 7F). a first tube stub having an axis parallel to a first axis direction; a second tube stub having an axis parallel to a second axis direction crossing the first axis direction; and a third tube stub having an axis parallel to a third axis direction crossing a plane surface including the first axis direction and the second axis direction, wherein the connection fitting (50A, 50B) includes an annular fitting body, a plurality of protrusions arranged in a circumferential direction at an end of the fitting body and having hooks in side surfaces of the protrusions, and a plurality of recesses formed between the protrusions adjacent to each other, when the connecting fitting (50A, 50B) is rotated in the circumferential direction with respect to the connection fitting of a connection target in a state where the protrusions of the connection fitting fit in the recesses of the connection fitting of the connection target, the hooks in the connection fittings engage each other prohibiting movement of the fitting body in an axial direction with respect to the projection of the connection fitting of the connection target, and the three or more tube stubs (5A, 5B, 5C, 5D) each include a rotation mechanism (7A, 7B) which rotatably connects the connection fitting of the tube stub and the tube body around axis of the tube stub, and when the connection fitting is rotated by the rotation mechanism, the connection fitting and the connection fitting of the connection target can be coupled or decoupled, wherein the first tube stub (5A, 5B), the second tube stub (5C, 5D) and the third tube stub (5E, 5F) each include the rotation mechanism (7A, 7B, 7C, 7D, 7E, 7F).