Bathroom Sink Drain Pipe Parts

The drain pipe under your bathroom sink is a crucial component that allows wastewater to flow from the sink to the main drain line. It is made up of several parts that work together to ensure proper drainage. Understanding these parts and their functions is essential for maintaining a functional drainage system.

P-Trap

The P-trap is the curved section of pipe that connects the sink drain to the drain pipe. It forms a U-shape or S-shape and is designed to trap water, creating a water seal. This water seal prevents sewer gases from escaping into the bathroom. When water flows through the sink, it fills the P-trap, creating a barrier between the drain and the sewer system.

Drainpipe

The drainpipe is the straight section of pipe that connects the P-trap to the main drain line. It usually runs vertically down through the wall or cabinet and carries wastewater away from the sink. Drainpipes are typically made of PVC, ABS, or copper.

Tailpiece

The tailpiece is a short piece of pipe that extends from the sink drain and connects to the P-trap. It is usually made of metal or plastic and provides a flexible connection between the sink and the drain system.

Slip Joint Nut

The slip joint nut is a large, threaded nut that connects the tailpiece to the P-trap. It has a rubber washer that creates a watertight seal. To tighten or loosen the slip joint nut, use a wrench or pliers.

Locknut

The locknut is a smaller nut that is located above the slip joint nut. It helps to keep the slip joint nut in place and prevent leaks. The locknut is usually tightened using a screwdriver or wrench.

Washers

Washers are thin, rubber gaskets that create watertight seals between different pipe components. They are usually placed on the threads of nuts and bolts to prevent leaks. Washers are an essential part of the drain pipe assembly and should be replaced if they become damaged or worn.

Flange

The flange is a circular plate that is attached to the bottom of the sink drain. It creates a seal between the sink and the drainpipe and prevents water from leaking around the drain hole. The flange is usually made of metal or plastic.

Stopper

The stopper is a device that is used to close the sink drain. It can be made of rubber, plastic, or metal and fits into the drain hole. The stopper prevents water from flowing out of the sink when it is not in use.