Kitchen Sink Drain Pipe Size

All the pipes that connect to the tailpiece including the p trap assembly.

Kitchen sink drain pipe size.

Since the pipe is 1 1 2 inch in diameter kitchen drainpipes are also 1 1 2 inches in diameter. The drainpipe threads onto this pipe with a connector. These drains like bathroom and kitchen drains use a p trap which is a j shaped pipe that connects to the main drain line. Unlike drain pipe on the shower or tub that will be connected to two units this sink drain pipe will be connected to only one unit on the drain line.

However with vertical drain stack this drain pipe size can handle up to two units connection well too. Drains connect to either a 1 1 4 inch or 1 1 2 inch tail pipe. Some older sinks may have drains that connect to a 1 1 4 inch tailpiece but most modern drains have a 1 1 2 inch outlet. The horizontal pipes connect to the trap with a double wye tee which has two y shaped inlets and one outlet.

Compare the fixture to the minimum sizes of drainage pipe by fixture table. A single trap can service more than one sink but adjacent drains cannot be farther apart than 30 inches. The kitchen drainpipe connects to the drain under the sink. Kitchen sink is commonly connected up to two units or three units for one with disposer.

For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter.