Pop-up plunger

A pop-up plunger for selectively closing a generally cylindrical waste drain pipe having a seat at one end and closure actuator means remote from said one end comprising:

• a head portion including sealing means for engaging the seat of said waste drain pipe for closure thereof;
• a support portion extending axially of said seat from one side of the head portion into the waste drain pipe and adapted for engagement with the closure actuator means to effect axial displacement of the plunger relative to the waste drain pipe for opening and closing the waste drain pipe, said shank portion having guide means projecting into close proximity to said waste drain pipe to guide said plunger for axial displacement therein, said guide means providing at least one drain passage past said plunger affording communication from said seat to a drain through said waste drain pipe;
• and
• a hollow cylindrical foramenous rigid sleeve member mounted removably on said guide means to cover said drain passage adjacent the head portion and to fill the space between said guide means and the inner surface of said waste drain pipe adjacent said seat, the openings of said formanenous sleeve member affording flow of waste liquid therethrough but blocking the passage of discrete articles therethrough, said support portion further including annular shoulder means spaced from said head portion a distance corresponding to the axial length of said sleeve member for engaging and retaining the sleeve member captive between said head and said shoulder means against axial displacement, said support portion being separable from said head portion to afford said releasable mounting of said cylindrical sleeve member between said head portion and said annular shoulder means.