(under subclass 679) Subject matter wherein the apparatus has within a means to open, close or modify a passage in fluid communication with the drain of the sink or bath to control the flow of fluid.
(1) Note. A stopper is distinguished from a valve by being bodily removable from the sink or bath structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
671+, for a drain valve combined with a supply outlet.
682+, for a drain valve combined with an overflow.
SEE OR SEARCH CLASS
251, Valves and Valve Actuation, for a valve in general,
213+, for a mechanical movement actuator and especially subclasses 231+ a lever type mechanical movement actuator.
