Waterless Trap Seal, 3.5 Inch

One-way valve creates seal to eliminate floor issues and prevents and blocks things getting up through floor drain 3.5-inch connection Simple

Green Drain Green Drain 3.5 Drain Trap Seal - Green Drain from Ecoprod Technique UK

Shower Floor Drain Backflow Preventer, Waterless Trap Seal, One Way Drain Valve Sewer Core (2.63-3 inch, Blue)

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