Standard Kitchen Sink Drain Pipe Size

Since all kitchens use this size of pipe it is best to stick with it during any repair.

Standard kitchen sink drain pipe size.

A standard rule of thumb is that sewer pipes leading away from a toilet are 3 inches in diameter. 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. 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 inlet must match the supply pipe and it can be a 1 2 inch female pipe thread fpt connector for galvanized pipes a 1 2 inch compression or sweat connector for. This size is precisely the diameter of the pipe instead of the length. Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe. When installing a new kitchen sink drain or repairing an old leaking one you need a particular size drainpipe.

All the pipes that connect to the tailpiece including the p trap assembly. However most of the bathroom sinks use 1 inch drain pipe. A 2 inch sink strainer fits the standard bar sink drain. These drains like bathroom and kitchen drains use a p trap which is a j shaped pipe that connects to the main drain line.

It provides the right amount of flow to drain a kitchen sink during heavy use. 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.