(under subclass 255.01) Subject matter wherein the apparatus uses a piston in fluid communication with the obstruction to agitate the fluid to clean or clear the obstruction within or clear the obstruction from the drain pipe of the sink, bath or flush closet.
SEE OR SEARCH THIS CLASS, SUBCLASS:
694, for means to block the overflow preventing water from flowing into or gas escaping from the overflow.
SEE OR SEARCH CLASS
417, Pumps, appropriate subclasses for a pump of general utility, per se, which may be used to clear an obstruction but is not adapted for use on a bath, flush closet, sink or drain pipe.
418, Rotary Expansible Chamber Devices, appropriate subclasses for a rotary expansible chamber pump, per se.
