GlobMarbleSink Faucet Knockout Set FK8001 (4 pc)

These did exactly what I needed them to do in 2" concrete. They'd be better if they had a hole pre-drilled in the center for a screw, but I figured it out...Oh, and I had to peel off a fair amount of flashing...but that's really my only gripe. They stayed in place and came out fairly easily post-cure. And they survived, so I can use them again for a future pour.

A little small for my sink Knockouts for the factory under counter sink holes had to wrap tape around them to make them stay which made for difficult removal after concrete was hard

They held in place well durning the pour. The 2” cylinder came out ok, but the two tapered will not come out. I am going to drill a hole in them to see if I can use a screw and washer then pull it out. A material that isn’t rubber would work better for the knockout, maybe a HDPE would work better.

I've used these as knockouts for faucets and soap dispensers. They work fantastic and are worth the investment.

They work great

Perfect for knock outs on concrete countertops, also reusable.

Shipped quick and a quality product!

very reasonable price! great product!