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.

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. The diameter of the plumbing from the main sink is 1 1 2 which then connects to 2 waste pipe. Check local building codes. For example an 18 number gauge stainless steel sink provides longer wear and tear over a 22 number gauge stainless steel sink.

It provides the right amount of flow to drain a kitchen sink during heavy use. The main pipes which are the ones that come off the main water supply and the water heater are 3 4 inches in diameter. This pipe is the standard size for all kitchen sinks. A 2 inch sink strainer fits the standard bar sink drain.

Use this chart to count the number of fixture units that will be connected to a drain line and for the minimum drainpipe size. Drains connect to either a 1 1 4 inch or 1 1 2 inch tail pipe. If the largest stack or drain pipe connecting multiple fixtures on the system is a 4 inch diameter pipe ensure that the main drain pipe is at least 4 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. However the better quality comes with an 18 gauge which is 0 0500 inches. If a toilet connects to a drainpipe the pipe must be at least 3 inches. Size a standard rule of thumb is that sewer pipes leading away from a toilet are 3 inches in diameter.