Fast flow thread in lavatory drain

Abstract

A splash-proof lavatory drain consists of a top, a tailpiece tube, and a flanged threaded pipe penetrating a drain hole in a vessel interior, wherein the flange engages the rim of the drain hole and is tightened by a nut and seals against the underside of the vessel. The top is a laterally perforated tube surmounted with a dome. The tube portion of the top inserts into the upper interior of a central perforation of the flange such that the dome prevents splash back from the drain interior and the rectangular perforations allow for drainage. This top is attached to the flanged threaded pipe by a range of means including a thread mate or a press fit. Drainage flow is increased by notching the lower edge of each perforation. Drainage flow is increased by notching the bottom of the perforations either partly or fully to the bottom of the top tube.

1 . A flanged threaded pipe with a tubular top surmounted by a dome, wherein:
 the tube part of the top is rectangularly perforated laterally and the tube is inserted concentrically into a top central perforation of the flanged threaded pipe to a set depth that leaves the bottom edge of the lateral perforations of the tube flush with the pipe flange and available for water to drain through, constituting a drain fitting for a vessel.   
     
     
         2 . A drain fitting as claimed in  claim 1 , wherein:
 the cylindrical ring of the tube part of the top distal from the dome top is notched at the bottom of the tube perforations, this notching being fully to the bottom of the tube part of the top.   
     
     
         3 . A drain fitting as in  claim 1 , wherein:
 the cylindrical ring of the tube part of the top distal from the dome top is partly notched at the bottom of the tube perforations, this notching not reaching the bottom of the tube part of the top.