A pump includes a cylinder, a piston, a connecting rod, a plug, a nozzle and a
fastener. The cylinder includes a first open end and a second open end. The piston
is movable in the cylinder. The connecting rod includes a first end connected with
the piston in the cylinder and a second end located outside the cylinder. The plug
is fit in the first open end of the cylinder. The nozzle is mounted on the first
open end of the cylinder. The fastener is used to fasten the nozzle and the plug
to the cylinder.
