Abstract: A nozzle 33 is formed on a distal end side of a cylinder 3. The nozzle 33 has an intermediate portion 3b formed such that a tip 7 is freely attachable thereto and detachable therefrom. The intermediate portion 3b of the nozzle 33 is formed with an annular projection 3e for retaining the tip 7. The tip 7 has a thick portion 7a provided in a root portion thereof and formed larger in diameter than a root portion 3a of the nozzle 33 to be abuttable against a tip releasing member 11. Along an inner periphery of the root portion of the tip 7, an annular projection 7b is formed to contact with the annular projection 3e of the nozzle 33 thereby providing a seal with the nozzle 33. Both the annular projections 3e and 7b of the nozzle 33 and the tip 7 are arranged to reach a position where a sound of abutment is produced between the root end surface of the tip 7 and the shoulder of the nozzle 33 at the completion of fitting of the tip 7 onto the nozzle 33.

Abstract: A cylinder 3 in a casing 2 is provided with a first suction chamber 34 and a nozzle part 33 having a suction passage 3d in communication with the first suction chamber 34. In the casing 2. a first piston 4 which is slidably inserted into the first suction chamber 34 and includes a second suction chamber 43 is provided with pushed in a direction of protruding from the first suction chamber 34. Further, in the casing 2, a second piston 5 slidably inserted into the second suction chamber 43 is provided with pushed with less resiliency than with respect to the first piston 4 in a direction of protruding from the second suction chamber 43. At the top part of the casing 2, an operating lever 6 is provided for operating the first and second pistons 4 and 5 to switch between a small suction position that the second piston 5 is embedded in the first piston 4 and a large suction position that the first and second pistons 4 and 5 are embedded in the cylinder 3 and the first piston 4, respectively.