Abstract: A drain-cleaning device adapted to unclog drains and pipes having various sized openings and toilet bowls having various outlet configurations, the device comprising an inverted flexible and resilient cup defined by a dome-shaped inner wall surface and an outer annular wall surface which includes a plurality of contiguous annular rim members, each being formed with a predetermined diameter to fit a corresponding drain or pipe opening when placed thereover, the cup being adapted to receive water therethrough under pressure, and the device further including a bulbous plug fitting adapted to be secured to the central opening disposed in the cup member so as to protrude outwardly therefrom in order to be directly received in a corresponding opening, whereby the opening can be sealed by the plunger as water passes therethrough.