Kitchen Sink Pipe Size
seattle 2022. Shop new season styles at browns online. But as far as the pipe or standard size pvc for sink drain is concerned, it's 2 or 3 ½ inches in diameter.
A kitchen trap arm can be 2 in diameter. When water empties from the kitchen sink, it goes through a sometimes complex network of pipes before it gets to the main waste pipe, which is typically in the wall. For example, if the circumference is 12.57 inches (319 mm), you would divide by pi, and get an outside diameter of about 4 inches (100 mm).
All of the other drains feed into this main septic outlet underneath the toilet.
Between the intersection with the sink s drain pipe and the toilet s waste pipe the vent pipe is acting as the sink s drain and the toilet s vent and so must be 2 in diameter. Kitchen sink vent pipe code. In this case, your vent pipes slope should be 1/8 inch per foot at least. The minimum pipe size for the drain parts under the sink and including the p trap is 1 1 2 inch.