Two-Tone Silicone Floor Drain Backflow Preventer Core, Odor-Proof Sewer Pipe Drain Seal for Kitchen, Bathroom

This two-pack of floor drain backflow preventer cores features a flexible silicone body combined with a stable plastic collar to fit standard sewer pipes. The self-closing silicone seal opens under water pressure to allow smooth drainage and automatically seals shut when empty to block sewer odors, sewer gas, and backflow. Suitable for kitchen, bathroom, and laundry room floor drains, these insert cores install directly into existing plumbing layouts without specialized tools, providing a practical solution for maintaining a fresh home environment.