Pop-Up Stopper Assembly

A stopper assembly installable inside an existing drain without tools, the stopper assembly having a base, a spring assembly, a traveler and a plurality of sealing rings. At least one sealing ring is desirably disposed around a lower portion of the base and frictionally engages an inside wall of the existing drain. Another sealing ring is desirably disposed around the traveler and frictionally engages an inside wall of the base when the traveler is disposed in the closed position relative to the base. A relatively wide flange disposed at the top of the base desirably extends radially beyond the periphery of the existing drain fixture,