A little bar sink usually does not need to take care of a lot drainage, and its own precut hole might be very tiny. It’s okay to maintain the width of the sink’s drain opening throughout the P-trap assembly, although you can raise it if desired.
Drain Size
A sink drain can’t have a larger diameter than the hole in the sink, which can be as little as 1 1/4 inches in a little bar sink. You can make the sink tailpiece, P-trap and extension arm all the exact same diameter, or you may increase their sizes to 1 1/2 inches, which ensures more efficient draining. The waste line into which they empty usually is 2 inches in diameter; then you will need an adapter to link the trap arm into the waste line.
Venting
Each Plumbing Sacramento repair specialists fixture must have a port to allow in atmosphere and equalize pressure, and the minimal diameter of the port is 1/2 inch smaller than the drain tube it services. Vents in general can’t be any less than 1 1/4 inches in diameter, however, so the port for both a 1 1/4- and also a 1 1/2-inch trap arm must be at least a size.