1 3/4" Drains
Glass vessel sinks use a 1 3/4" drain and are generally used as head sinks. 1 3/4" drains are the standard size drain for vessel sinks in North America and Europe.
The name, 1 1/2" Drain, does not refer to the specific size of the hole in the sink or diameter of the drain, but is used as a standard term.
If you need a configuration that is not shown, simply ask your sales representative for options. Minimum annual commitment and additional lead-time may be required for non-standard configurations.