Standard Kitchen Sink Drain Pipe Size

When installing a new kitchen sink drain or repairing an old leaking one you need a particular size drainpipe.

Standard kitchen sink drain pipe size.

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. A 2 inch sink strainer fits the standard bar sink drain. Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe. However most of the bathroom sinks use 1 inch drain pipe.

Since all kitchens use this size of pipe it is best to stick with it during any repair. It provides the right amount of flow to drain a kitchen sink during heavy use. Drains connect to either a 1 1 4 inch or 1 1 2 inch tail pipe. These drains like bathroom and kitchen drains use a p trap which is a j shaped pipe that connects to the main drain line.

The standard size and setting. All the pipes that connect to the tailpiece including the p trap assembly. The main sewer pipe leading to the septic tank or public sewer is usually 4 inches. The 1 2 inch supply pipes that come to the sink each terminate with a shutoff valve and this valve is one of the two factors that determine the connector size on the faucet hose.

This size is precisely the diameter of the pipe instead of the length. Sewer drains from laundry sinks or washing machines are 2 inches in diameter and those from sinks in the kitchen bathroom or powder room generally use a 1 5 inch pipe.