Designed to seal floor drains and sump covers without sacrificing functionality, it keeps your radon mitigation system running efficiently by preventing vacuum loss. Its smart, flexible design fits perfectly in a 4" opening—or trim it down to fit 3", 2", or even 1.5" drains with ease. Trusted by professionals every day, it’s the ideal low-flow drain that also doubles as a convenient, removable access port in sump covers. Clean, simple, and built for performance