Deep Overflow Adjustable Round Overflow and Drain.
This is the dial on the overflow portion of your drain that lets you adjust the exit from the bottom to the top of the overflow. Allows you to add up to 2.5 inches in water level to your one person whirlpool bathtub, deep or long 2 person whirlpool bathtub, combination bathtub, or air tub. Available in Polished Chrome, Brushed/Satin Nickel, Oil Rubbed Bronze, White, and Biscuit. Bathtub controls must be moved to the tub deck to keep them out of the water!!!! This means that this drain can not be used when the bathtub is undermounted.