Abstract: A pipe connector includes a first connection unit having a first tube for the connection of an external water pipe, a first hole extending through two distal ends of the first tube, a plurality of annular flanges extending around the periphery of the first tube and a rotation prevention portion for preventing rotation of the connected external water pipe relative to the first tube; and a second connection unit defining therein a second hole in communication with the first hole of the first connection unit. The invention also provides a pipe assembly using the pipe connector.