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34 Posts
I have used my Rigid 3800 with a 5/8 cable and chain knocker with pretty good results: just keep the chain moving, don't let it dwell at any one spot or it will punch a hole in any weak cast iron. Come behind with a camera and plenty of water to flush out the debris. If it's liberty pipe, don't try a knocker---- you will do nothing but put more cracks in the already crack ed up pipe. For those of you who don't know what liberty pipe is: It was cast iron manufactured during WW2 and was made to conserve metal, meaning it was thin and flimsy. Look for a star on the bell.