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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.
Find the correct sink piping to fit the water supply line, which is usually a 3/4-inch copper pipe. Measure the end of the main water supply where the piping attaches near the valve shut-off to determine the pipe size.To fit the sink piping to this line may require a 1/2 reducer, as the lines running from the supply line to the sink are usually 1/2 inch lines.nstructions. Measure the distance between the main water valves underneath your sink to the sink faucet. Main lines typically run through floor joists and branch up into the walls in the bathroom and kitchen. The lines stub out underneath the sink with the left supply being hot and the right supply being cold.