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The most common kitchen counter height is 36 inches, but it can vary from 30 to 45 inches. The standard kitchen sink is 8 inches deep, which means that the normal distance between a kitchen sink drain and the floor is 28 inches. This will vary, depending on the height of the counter and the depth of the sink bowl. In the bathroom, the sink drain is typically between 24 inches above the floor.
The toilet is vented through the sink drain. The toilet drain should be 3â³, the sink drain is 1.5â³, the shared sink drain/toilet vent area should be 2â³, and the vent going up should be 1.5â³. Also note that where the 2â³ drain connects to the 3â³ at the bottom the fitting should be a y instead of a tee as shown.