PURPOSE: To ensure the sealing by forming a plurality of tubular lines on a first disk member having an outer surface to be sealed and engaged with an outwardly opened conical mouth on a first fitting body, screwing a second disk member having the tubular lines of the same number as that of the first one, and providing the tubular lines with the ferrules.

CONSTITUTION: A connector body 12 comprises an inner passage 22 and an outwardly opened conical mouth 26 connected to the inner passage 22, and a male screw 28 is formed on its outer periphery. A first disk member 30 is a conical outer periphery having a slightly smaller conical angle, a plurality of tubular lines 38 are formed thereon, and the outer periphery of the tubular lines is conical. A second disk member 40 also comprises the tubular lines of the same number as that of the disk member 30, the tubes are inserted into both disks, and the ferrules 64, 66 where the tubes are inserted into the conical holes on the outer periphery of tubular lines, are mounted. By fastening a nut 46, the disc 40 is pressed to the disc 30, and the disc 30 is pressed to the mouth 26, whereby the tubular lines are sealed.