- 10-Pack of single-use foam drain knockouts.
- Available in 2 sizes for Bathroom and Kitchen size drain holes.
- Sink drain knockouts made from extruded polystyrene.
- Easy removal- just cut out of cured concrete using a utility knife or flat head screw driver.
- Freshly cured/curing concrete can crack easily from stress of trying to remove hard objects/mold forms. These foam knockouts are designed for easy removal that won't add stress to the concrete.
- Small: 1-5/8" Diameter*, 2"H.
- Large: 3-1/2" Diameter*, 2"H.
- *Diameter sizes may vary slightly, but still fall within sizing needed for drain hardware to fit.
- To Use-Place drain knockout on Sink Mold with silicone. Optional- run a bead of silicone around the knockout.
- Wrap foam knockout with Concrete Countertop Form Tape (sold separately) if you need a smooth, glossy concrete surface.
- Foam knockouts can also be used to create a circular hole in a concrete countertop (for passing phone lines, electrical cords, computer cables, etc.).