A pump includes a main body, a water outlet connector rotatably mounted on the main body, and a positioning bar detachably mounted on the main body and rested on the water outlet connector for locking the water outlet connector on the main body. Thus, the included angle between the water outlet of the water outlet connector and the main body can be adjusted easily and conveniently without needing aid of an additional tool, thereby facilitating the user adjusting the included angle between the water outlet connector and the main body.