Every sink has a drain line plumbed to the main drainage line in the home. This drain line is made up of pipes, each with a certain size. Since different sinks are used for a variety of things and have different flow rates, the drainpipe sizes are adjusted to accommodate them.
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The kitchen sink is the most frequently used sink in the house, so the drainpipe is slightly larger than the bathroom sink. The kitchen sink drainpipe is 1 1/2 inches in diameter. It is larger to handle food wastes and water from dishwashing and cooking. This pipe runs from the sink bottom to the P-trap and then on to the home's main drainpipe. Kitchen drainpipes are not standardised, and some kitchens with smaller sinks and lower water flow use 1 1/4-inch pipes.
The bathroom sink drain is smaller in size because the bathroom sink is only used for washing and shaving. Bathroom drainpipes are 1 1/4 inches in diameter. These pipes connect to the sink's drain hole and house the drain plug. Bathroom drains also use a P-trap that connects to the home's main drain line. A reducing bushing, a pipe fitting with one end a slightly smaller diameter than the other, connects the drainpipe to the home's main drain line.
Shower drainpipes handle a larger volume of water; therefore, they measure in at 2 inches in diameter. Since shower head flow rates are lower today, some shower drainpipes measure only 1 1/2 inches. Shower heads with reduced flow rates of 2.5 gallons per minute drain sufficiently into smaller drainpipes. The size of the pipe does affect drainage and, since showers drain constantly, a larger pipe ensures consistent and effective draining.
Tub drainpipes measure 1 1/2 inches in diameter, which is smaller than a shower drain. Since showers must drain steadily during use, they require larger drainpipes. A tub drain only requires sufficient drainage to empty the tub after each use. The tub drain is also fit to a P-trap which feeds into the home's main drain line. The same reducing bushings make the connections between different sized pipes if necessary.
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