Semi Truck Engine Expansion Plugs

Had to replace freeze plug in the middle of my block, on my 30 yr old Skylark. The original one was pretty rusted and slightly seeping. The core plug delivered came with a center bolt to expand it and was in a good shape for replacement. The main thing that due to expandable rubber it was easy to install. So, I simply punched the new one in with an appropriate socket and the job was done!