Standard Sink Drain Pipe Size

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.

Standard sink drain pipe size.

Other is 4 inches to left of centerline discharge hole vertical. The minimum toilet vent size depends on your plumbing code. Sink rough in details. In the ipc toilet vents are 1 5 in the upc it s 2 inches.

One hole is 4 inches to the right of centerline. The standard size and setting. Although most bathroom sink drain holes are similar in size to coordinate with the drains and plumbing used with the sinks themselves there is no single standard size for them. Since all kitchens use this size of pipe it is best to stick with it during any repair.

This size is precisely the diameter of the pipe instead of the length. It provides the right amount of flow to drain a kitchen sink during heavy use. Vertically both are about 2 to 3 inches above the drain pipe supply lines horizontal. Don t get confused with the hole size and the actual pipe size.

However most of the bathroom sinks use 1 inch drain pipe. A standard rule of thumb is that sewer pipes leading away from a toilet are 3 inches in diameter. Every state may have different code on plumbing and it may affect the required size of the bathroom sink pipe. But as far as the pipe or standard size pvc for sink drain is concerned it s 2 or 3 inches in diameter it s the measurement that surrounds the center of the drain from both sides.

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. 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. When installing a new kitchen sink drain or repairing an old leaking one you need a particular size drainpipe. The main sewer pipe leading to the septic tank or public sewer is usually 4 inches.

The most common size of the drainage hole in a bathroom sink is 1 1 4 inches in diameter although you may also find some with a diameter of 1 1 2 inches or more. More on venting a toilet here. Compare the fixture to the minimum sizes of drainage pipe by fixture table. Sizing individual plumbing vents.

All the pipes that connect to the tailpiece including the p trap assembly. Consider drain pipe to be the vertical centerline. For instance the minimum pipe diameter for a washing machine drain is pipe with a 1 1 2 inch diameter. 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.

To connect the appropriate size vent into the hub of the 3 sanitary tee you ll need a flush bushing. Flush bushings kind of look like hockey pucks.