Recommended drain for DeRose Oval Glass Vessel Sink

Kohler k-2355-0 Archer Undercounter Bathroom Sink
Overview
Kohler has become a warm trend in light commercial and residential bathroom and restroom design in recent years. The Archer undercounter toilet features the transitional aesthetic of the Archer Suite, blending subtle design elements create in craftsman furniture's chamfering methods and the intricate surfaces of jewelry.
This mixture of chamfered edges and curved bases create an endless appeal that suits a collection of design ideas. If you are looking for top recommended Archer Undercounter Bathroom Sink, then KOHLER K-2355-0 Archer Undercounter Bathroom Sink is my suggestion.
The KOHLER K-2355-0 Archer Bathroom Sink, completed with a lot of competences which makes it great product. This sink provides clamp assembly classic rectangular basin which is 19-7/8?L x 15-5/16?W x 7-1/2?H.
Specifications

• Installation Type: Undermount
• Basin Depth: 3.75"
• Basin Width: 13"
• Basin Length: 17-5/8"
• Material: China
• Number of Holes: 0
• Shape: Rectangle
• Style: Contemporary/Modern
• Texture: Polished
• Drain Outlet Connection: 1-3/4"

Is this any help?
https://sites.google.com/site/bathroomfurniturevanitysink/installation-on-vanities/glass-vanity-set-up-guide-kk09

Otherwise you could send them an email:
http://www.kokolsinc.com/pages/contact-us/

a vessel I dont beleive has a overflow. you need a differant waste for that unless theres something your not telling me

Pourly plumbed in, need to reconsider route of drain and slope to create the water gravity momentum which is visible on correct drain installations

Standard Vanity height is approx 34.5". A vessel vanity is approx 31" high. If you cannot remove the legs from your existing vanity then it will have to be replaced or cut down to the correct height. The reason a vessel vanity is lower is because your sink will be approx 3 to 6 inches higher than a standard drop in sink. This may be more work than it is worth. Vessel sinks most often will require a solid surface top, either glass, stone or another type of composite material. The standard laminate vanity top has a particle board substrate which will detiorate quickly at the drain location.

this is not supposed to happen, either drain not installed properly or drain is clogged. suggest trying drain cleaner first if sink has been in for a period of time. if sink is recently installed call whoever installed and have them fix the drain

THE PART YOU ARE TALKING ABOUT IS CALLED DRAIN TAIL PIECE. THE DRAIN YOU CAN REMOVE BY LOSENING THE NUT UNDER THE SINK WHILE SOME ONE HOLDS THE DRAIN INSIDE THE SINK FROM TURNING THE OART KEAKING IS CALLED A SPUD GASKET WHICH SEALS THE DRAIN TO THE SINK

a waste with a over flow does not work well with a vessel sink because the sink is to thin

YOU ALSO HAVE A VENT ISSUE, THE VESSEL SINK DOESN'T HAVE THE LITTLE HOLE IN IT LIKE A VANITY SINK, THERE FOR THE WATER IS GOING DOWN THE DRAIN BUT THE AIR CAN NOT COME OUT, YOU NEED TO INSTALL A STUDOR VENT OR AN INLINE VENT INTO THE DRAIN BETWEEN THE WALL AND THE TRAP CUT IN A TEE AND BRING A PIPE UP TO THE BOTTOM OF THE COUNTER TOP AND INSTALL THE VENT, USALLY HAVE TO PUT A FEMALE ADPT ON THE TOP OF THE PIPE THE VENT COMES WITH THREADS DO NOT GLUE IT IN PLACE, THEY HAVE A RUBBER FLAPPER THAT OPENS WHEN THE WATER IS GOING THRU THE DRAIN AND ALLOWS IT TO PULL IN AIR THEN THE FLAP CLOSES WHEN NO WATER IS RUNNING TO KEEP THE SEWER SMELL OUT

have the plumber pop an opening on the side of the drain pipe under the sink. and add a indoor vent.