Abstract: A sink drain may include a drainage tube, a strainer, an O-shaped sealing pad, a drain cover, and a general bolt. The drainage tube has a blocking edge at an upper end thereof, and a thread nut is disposed on the drainage tube. The strainer has a cup-shaped main body, and a thread portion is formed on the outer periphery of a lower section of the main body. The thread nut of the drainage tube is engaged with the thread portion of the strainer to complete the connection between the drainage tube and the strainer. The sealing pad, which is elastically deformable, has a first section and a second section, and the first section having a larger diameter than the second section is located above the second section. The drain cover with a second O-ring is downwardly put in a second drainage hole of a sink.

Abstract: A sink drain may include a drainage tube, a strainer, an O-shaped sealing pad, a push-type water valve, and a general bolt. The drainage tube has a blocking edge at an upper end thereof, and a thread nut is disposed on the drainage tube. The strainer has a cup-shaped main body, and a thread portion is formed on the outer periphery of a lower section of the main body. The thread nut of the drainage tube is engaged with the thread portion of the strainer to complete the connection between the drainage tube and the strainer. The sealing pad, which is elastically deformable, has a first section and a second section, and the first section having a larger diameter than the second section is located above the second section. The push-type water valve with a second O-ring is downwardly put into a third drainage hole of a sink.

Abstract: A water channel switching structure in a faucet includes a faucet body and a switching unit, wherein the faucet body has the switching unit near a gate, and the switching unit has one control stick, a connecting unit, a driving stick and a valve piece. A connecting end of the control stick is connected with the connecting unit and one side of the connecting unity has a supporting surface to be against a resilient unit. The other side of the connecting unit has a through connecting hole that can be passed through by the driving stick with a connecting end. One side of the valve piece is an attaching surface that is attached to the gate of the faucet body, and an interconnecting hole is recessedly formed to connect with the connecting end of the driving stick. According to the structure stated above, when the water is cut off, the connecting unit is pushed by the resilient unit to force the valve piece to detach from the gate, which can actually achieve the goal of automatic switching.