OHOH 2 Pack Drain Backflow Preventer Silicone Drain Backflow Preventer Sink Floor Drain Seal One Way Valve for Pipes Tubes in Toilet Bathroom Floor Drain Seal Keep Out Smell

Color:Blue What is In the Box: 2* Silicone Drain Backflow Preventer 2* Anti-rust steel filter 2* Stable steel ring Size:3.74 x 1.97 x 1.97 inches Installation guide: 1. Please measure precisely the internal diameter of the drain mouth, in case any inconvenience brought by unmatched size 2. Measure the depth of the tube 3. Install the floor drain one way valve 4. Because the stickiness and softness feature of silicone, make sure support apart the mouth of drain grate with your hands in the first installation for the smooth draining