Standard Kitchen Sink Drain Pipe Size

Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe.

Standard kitchen sink drain pipe size.

The standard size and setting. 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. A standard rule of thumb is that sewer pipes leading away from a toilet are 3 inches in diameter. This size is precisely the diameter of the pipe instead of the length.

A 2 inch sink strainer fits the standard bar sink drain. 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. 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. Since all kitchens use this size of pipe it is best to stick with it during any repair.

All the pipes that connect to the tailpiece including the p trap assembly. When installing a new kitchen sink drain or repairing an old leaking one you need a particular size drainpipe. Drains connect to either a 1 1 4 inch or 1 1 2 inch tail pipe. This pipe is the standard size for all kitchen sinks.

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 main sewer pipe leading to the septic tank or public sewer is usually 4 inches.